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Get here all the Important questions for Class 12 Chemistry chapter wise as free PDF download. Here you will get Extra Important Questions with answers, Numericals and Multiple Choice Questions (MCQ's) chapter wise in Printable format. Solving Chapter wise questions is one of the best ways to prepare for the examination. Students are advised to understand the concepts and theories of Chemistry properly before the exam. You can easily find 1 Mark, 2 marks, 3 marks, and 5 marks questions from each chapter of Class 12 Chemistry and prepare for exam more effectively. These preparation material for Class 12 Chemistry , shared by teachers, parents and students, are as per latest NCERT and CBSE Pattern syllabus and assure great success in achieving high score in Final CBSE Board Examinations.

Latest MCQ's and Important Questions for CBSE Class 12 Chemistry

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CBSE Class 12 Chemistry Syllabus

• Solid State
• Electrochemistry
• Chemical Kinetics
• Surface Chemistry
• General Principles and Processes of Isolation of Elements
• p-Block Elements
• d- and f-Block Elements
• Coordination Compounds
• Haloalkanes and Haloarenes.
• Alcohols, Phenols and Ethers
• Aldehydes, Ketones and Carboxylic Acids
• Organic compounds containing Nitrogen
• Biomolecules
• Chemistry in Everyday life

Unit II: Solutions 15 Periods

Types of solutions, expression of concentration of solutions of solids in liquids, solubility of gases in liquids, solid solutions, Raoult's law, colligative properties - relative lowering of vapour pressure, elevation of boiling point, depression of freezing point, osmotic pressure, determination of molecular masses using colligative properties, abnormal molecular mass, Van't Hoff factor.

Unit III: Electrochemistry 18 Periods

Redox reactions, EMF of a cell, standard electrode potential, Nernst equation and its application to chemical cells, Relation between Gibbs energy change and EMF of a cell, conductance in electrolytic solutions, specific and molar conductivity, variations of conductivity with concentration, Kohlrausch's Law, electrolysis and law of electrolysis (elementary idea), dry cell-electrolytic cells and Galvanic cells, lead accumulator, fuel cells, corrosion.

Unit IV: Chemical Kinetics 15 Periods

Rate of a reaction (Average and instantaneous), factors affecting rate of reaction: concentration, temperature, catalyst; order and molecularity of a reaction, rate law and specific rate constant, integrated rate equations and half-life (only for zero and first order reactions), concept of collision theory (elementary idea, no mathematical treatment), activation energy, Arrhenius equation.

Unit VIII: d and f Block Elements 18 Periods

General introduction, electronic configuration, occurrence and characteristics of transition metals, general trends in properties of the first-row transition metals – metallic character, ionization enthalpy, oxidation states, ionic radii, colour, catalytic property, magnetic properties, interstitial compounds, alloy formation, preparation and properties of K2Cr2O7 and KMnO4.

Lanthanoids – Electronic configuration, oxidation states, chemical reactivity and lanthanoid contraction and its consequences.

Actinoids - Electronic configuration, oxidation states and comparison with lanthanoids.

Unit IX: Coordination Compounds 18 Periods

Coordination compounds - Introduction, ligands, coordination number, colour, magnetic properties and shapes, IUPAC nomenclature of mononuclear coordination compounds. Bonding, Werner's theory, VBT, and CFT; structure and stereoisomerism, the importance of coordination compounds (in qualitative analysis, extraction of metals and biological system).

Unit X: Haloalkanes and Haloarenes. 15 Periods Haloalkanes: Nomenclature, nature of C–X bond, physical and chemical properties, optical rotation mechanism of substitution reactions.

Haloarenes: Nature of C–X bond, substitution reactions (Directive influence of halogen in monosubstituted compounds only). Uses and environmental effects of - dichloromethane, trichloromethane, tetrachloromethane, iodoform, freons, DDT.

Unit XI: Alcohols, Phenols and Ethers 14 Periods

Alcohols: Nomenclature, methods of preparation, physical and chemical properties (of primary alcohols only), identification of primary, secondary and tertiary alcohols, mechanism of dehydration, uses with special reference to methanol and ethanol.

Phenols: Nomenclature, methods of preparation, physical and chemical properties, acidic nature of phenol, electrophilic substitution reactions, uses of phenols.

Ethers: Nomenclature, methods of preparation, physical and chemical properties, uses.

Unit XII: Aldehydes, Ketones and Carboxylic Acids 15 Periods

Aldehydes and Ketones: Nomenclature, nature of carbonyl group, methods of preparation, physical and chemical properties, mechanism of nucleophilic addition, reactivity of alpha hydrogen in aldehydes, uses.

Carboxylic Acids: Nomenclature, acidic nature, methods of preparation, physical and chemical properties; uses.

Unit XIII: Amines 14 Periods

Amines: Nomenclature, classification, structure, methods of preparation, physical and chemical properties, uses, identification of primary, secondary and tertiary amines.

Diazonium salts: Preparation, chemical reactions and importance in synthetic organic chemistry.

Unit XIV: Biomolecules 18 Periods

Carbohydrates - Classification (aldoses and ketoses), monosaccharides (glucose and fructose), D-L configuration oligosaccharides (sucrose, lactose, maltose), polysaccharides (starch, cellulose, glycogen); Importance of carbohydrates.

Proteins - Elementary idea of - amino acids, peptide bond, polypeptides, proteins, structure of proteins - primary, secondary, tertiary structure and quaternary structures (qualitative idea only), denaturation of proteins; enzymes. Hormones - Elementary idea excluding structure.

Vitamins - Classification and functions. Nucleic Acids: DNA and RNA.

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Question Bank of Other Subjects of Class 12

Importance of Question Bank for Exam Preparation?

There are many ways to ascertain whether a student has understood the important points and topics of a particular chapter and is he or she well prepared for exams and tests of that particular chapter. Apart from reference books and notes, Question Banks are very effective study materials for exam preparation. When a student tries to attempt and solve all the important questions of any particular subject , it becomes very easy to gauge how much well the topics have been understood and what kind of questions are asked in exams related to that chapter.. Some of the other advantaging factors of Question Banks are as follows

• Since Important questions included in question bank are collections of questions that were asked in previous exams and tests thus when a student tries to attempt them they get a complete idea about what type of questions are usually asked and whether they have learned the topics well enough. This gives them an edge to prepare well for the exam.Students get the clear idea whether the questions framed from any particular chapter are mostly either short or long answer type questions or multiple choice based and also marks weightage of any particular chapter in final exams.
• CBSE Question Banks are great tools to help in analysis for Exams. As it has a collection of important questions that were asked previously in exams thereby it covers every question from most of the important topics. Thus solving questions from the question bank helps students in analysing their preparation levels for the exam. However the practice should be done in a way that first the set of questions on any particular chapter are solved and then solutions should be consulted to get an analysis of their strong and weak points. This ensures that they are more clear about what to answer and what can be avoided on the day of the exam.
• Solving a lot of different types of important questions gives students a clear idea of what are the main important topics of any particular chapter that needs to focussed on from examination perspective and should be emphasised on for revision before attempting the final paper. So attempting most frequently asked questions and important questions helps students to prepare well for almost everything in that subject.
• Although students cover up all the chapters included in the course syllabus by the end of the session, sometimes revision becomes a time consuming and difficult process. Thus, practicing important questions from Question Bank allows students to check the preparation status of each and every small topic in a chapter. Doing that ensures quick and easy insight into all the important questions and topics in each and every individual. Solving the important questions also acts as the revision process.

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CBSE Board Class 12 Chemistry Case Based Questions With Solutions

CBSE Board Class 12 Chemistry Case Based Questions With Solutions to prepare for the upcoming term 1 board exams are given here. It is extremely helpful since the expert team has crafted this by following the Syllabus of class 12th. Case study questions are also known as passage based problems because it includes the paragraph from which 5 or more problems are curated. 

To solve these types of problems students need to have a thorough understanding of all the basics and fundamental concepts. Also, a student who is good in problem solving skills can easily answer such questions.

Those who are preparing for their CBSE Class 12 board exam term 1 can use it to practice the questions on a daily basis. Also, the experts have given step by step solutions to all those problems so that students can cope up with the given problem very easily.

CBSE Class 12 Chemistry Case Based Questions, Assertion & Reason, MCQs

CBSE Class 12 Chemistry includes many chemical reactions, chemical bondings, theories, experiments, discoveries, etc. All of these types of things should be well versed by the students to answer the Case study, Multiple Choice Questions, Assertion and Reason. So, practicing the given CBSE Class 12 Chemistry Case Study PDF will be very handy in boosting the basic knowledge and preparing for the final papers. 

We have provided the complete set of PDFs so that candidates can prepare for the board examination very easily. Before attempting the given PDF candidates are suggested here to complete their syllabus for the term 1 exam. Doing so will aid in self-assessment and give a sense of board exam preparation.

Class 12 Chemistry Case Study Questions For Term 1 Exam  

Class 12 Chemistry Case Study Questions for Term 1 exam includes The Solid State, The P block elements, Haloalkanes and Haloarenes, Biomolecules, etc. Questions for all these chapters are given in the PDF file that are available here for free to download.

Term 1 exam is about to be held in November-December this year. So, students should start their board exam preparation early. For that purpose we have provided the complete chapter wise case based questions, assertion and reason and a lot of Objective type problems for the practice purposes.

CBSE 12 Case Based Question With Answers

CBSE Case Based Questions with Answers are designed and developed for the term 1 exam which is developed by the subject matter experts. The answers are provided to help the learners to solve the problem if they are stuck at some questions and don’t know how to tackle that.

Not only answers are given but step by step explanations are given too. By taking help of those explanations students can easily get a good grasp over the concepts.

To Download case study based questions class 12 chemistry PDF visit here or download from Selfstudys.com.

To solve Class 12 Chemistry Assertion and Reason Questions read the given statement and then reason. Now, you need to verify both the assertion and reason. If both are given correctly then you have to check whether the given reason supports the statement or not.

CBSE Class 12 Mid Term/Half Yearly Exam 2024-25 : Mathematics Question Paper with Solution; Download PDF

CBSE Class 12th Exam 2024-25 : Skill Subject Sample Papers and Marking Scheme Released; Download PDF

CBSE Class 12 Board Exam 2025 : Full-Year Study Plan for Top Scores - Achieve 99%+

Can You Start Preparing for JEE in Class 12? Here's What You Need to Know

CBSE Class 12 Compartment Results 2024 Released, Pass Percentage at 29.78% - Direct Link Here

CBSE 12th Exam 2024-25 : Mathematics (Volume-2) Official Competency Focused Practice Questions released by CBSE

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CBSE Class 12 Chemistry Case Study Questions PDF

Case studies play a pivotal role in CBSE Class 12 Chemistry, as they enable students to apply theoretical knowledge to real-life scenarios. CBSE Class 12 Chemistry Case Study Questions PDF section introduces the significance of case studies in enhancing analytical skills and understanding complex chemical reactions.

Case studies challenge students to think critically, analyze experimental data, and devise problem-solving strategies. They provide a deeper understanding of chemical principles and their practical applications, fostering a holistic learning experience. Familiarize yourself with the structure of case study questions to streamline your preparation. Each case study presents a unique chemical problem, encouraging students to identify relevant concepts and devise accurate solutions.

Table of Contents

Class 12 Chemistry Case Study Questions

CBSE Class 12 Chemistry question paper will have case study questions too. These case-based questions will be objective type in nature. So, Class 12 Chemistry students must prepare themselves for such questions. First of all, you should study NCERT Textbooks line by line, and then you should practice as many questions as possible.

Chapter-wise Solved Case Study Questions for Class 12 Chemistry

Class 12 students should go through important Case Study problems for Chemistry before the exams. This will help them to understand the type of Case Study questions that can be asked in Grade 12 Chemistry examinations. Our expert faculty for standard 12 Chemistry have designed these questions based on the trend of questions that have been asked in last year’s exams. The solutions have been designed in a manner to help the grade 12 students understand the concepts and also easy-to-learn solutions.

Tips to Excel in CBSE Class 12 Chemistry Examinations

Excel in your Chemistry exams with these practical tips.

A. Regular Practice with Case Studies

Consistent practice with case study questions enhances your ability to tackle complex problems. Dedicate time to solving various case studies to build confidence.

B. Understanding Analytical Skills

Develop strong analytical skills to approach case studies logically. Break down complex problems into simpler components and analyze them step-by-step.

C. Time Management Strategies

Allocate sufficient time for each case study during the exam. Practice time management in mock tests to complete the paper within the stipulated time.

Best Books for Class 12 Chemistry

Strictly as per the new term-wise syllabus for Board Examinations to be held in the academic session 2024 for class 12 Multiple Choice Questions based on new typologies introduced by the board- Stand-Alone MCQs, MCQs based on Assertion-Reason Case-based MCQs. Include Questions from CBSE official Question Bank released in April 2024 Answer key with Explanations What are the updates in the book: Strictly as per the Term wise syllabus for Board Examinations to be held in the academic session 2024. Chapter-wise -Topic-wise Multiple choice questions based on the special scheme of assessment for Board Examination for Class 12th Chemistry.

Mastering CBSE Class 12 Chemistry case study questions is crucial for excelling in the exams. Embrace case studies as a valuable learning tool, and with practice, you’ll ace your Chemistry exams with confidence.

Benefits of Utilizing the CBSE Class 12 Chemistry Case Study PDF

• Enhanced Learning Experience : The case study PDF offers practical examples and scenarios, making the learning process engaging and relatable for students.
• Application of Theoretical Concepts : It enables students to apply theoretical knowledge to practical situations, honing their problem-solving and analytical skills.
• Real-World Relevance : By connecting classroom learning to real-life applications, students can grasp the practical significance of chemistry in various industries.
• Critical Thinking Development : Analyzing case studies encourages students to think critically and make informed decisions based on chemical principles.
• Exam Preparation : Exposure to case studies aids in better preparation for chemistry examinations by providing a comprehensive understanding of the subject.

The CBSE Class 12 Chemistry case study PDF brings a refreshing perspective to the world of education. By intertwining theoretical knowledge with practical applications, it equips students to face real-world challenges with confidence. The diverse case studies provide invaluable insights, encouraging students to explore chemistry beyond the classroom and make a positive impact on society.

What is the CBSE Class 12 Chemistry case study PDF?

The CBSE Class 12 Chemistry case study PDF is a curated document by CBSE, presenting real-life applications of chemistry concepts for students to understand the subject’s practical relevance.

How does the case study PDF benefit students?

The case study PDF enhances the learning experience, fosters critical thinking, promotes application-based learning, and prepares students for examinations.

Are the case studies diverse in content?

Yes, the case studies cover various branches of chemistry, including organic, inorganic, physical, environmental, and analytical chemistry.

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Class 12 Chemistry Case Study Questions PDF Download

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Looking for Class 12 Chemistry Case Study Based Questions in PDF format? This comprehensive article provides expert insights, engaging content, and answers to frequently asked questions to help you excel in your studies. Download the PDF now and boost your chemistry knowledge!

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You need to improve your preparation for the Class 12 Chemistry Case Study Questions exams if you want to achieve a 95+% on the boards. You may find case study questions from every chapter that will be covered in the CBSE Class 12 Chemistry Board Exams in this post.

Table of Contents

Case Study-Based Questions for Class 12 Chemistry

Welcome to the world of Class 12 Chemistry Case Study Questions! As a student pursuing Chemistry in the 12th grade, you have already shown dedication and commitment to the subject. However, dealing with case study-based questions can be both intriguing and challenging. In this article, we will explore the nuances of such questions and offer valuable guidance to excel in your exams.

Class 12 Physics Case Study Questions Class 12 Chemistry Case Study Questions Class 12 Biology Case Study Questions Class 12 Maths Case Study Questions

Importance of Class 12 Chemistry Case Study-Based Questions

Class 12 Chemistry case study-based questions play a vital role in your overall understanding of the subject. They enable you to:

• Apply Theoretical Knowledge : Case studies allow you to apply the concepts you have learned in real-life situations, bridging the gap between theory and practical application.
• Develop Analytical Skills : By critically analyzing case scenarios, you enhance your analytical abilities, which are essential in various professional fields.
• Enhance Problem-Solving Abilities : Tackling case study-based questions hones your problem-solving skills, preparing you to face challenges with confidence.
• Gain Deeper Insights : Exploring different case studies exposes you to a wide range of chemical reactions and phenomena, broadening your understanding of Chemistry.

Tips to Excel in Class 12 Chemistry Case Study Questions

• Thoroughly Understand the Concepts: Before attempting case study questions, ensure you have a strong grasp of the underlying concepts and theories.
• Analyze the Scenario Carefully: Take your time to read and comprehend the given case study. Pay attention to every detail to identify the key points.
• Relate to Real-Life Scenarios: Try to connect the case study with real-life situations, as this will make the problem-solving process more intuitive.
• Practice Regularly: Practice a wide variety of case study questions to familiarize yourself with different scenarios and improve your problem-solving skills.
• Collaborate with Peers: Engage in group discussions and brainstorming sessions with your peers. This will provide diverse perspectives and enhance your critical thinking.

Best Books for Class 12 Chemistry

Strictly in accordance with the new term-by-term curriculum for the Class 12 Chemistry Case Study Questions exams to be held in the academic session 2024, including the new board-introduced multiple-choice question types, Stand-Alone MCQs, and MCQs based on Assertion-Reason Case-based MCQs. Included are inquiries from the official CBSE Question Bank that was released in April 2024. What changes have been made to the book: strictly in accordance with the term-by-term syllabus for the board exams that will be held during the 2024 academic year? Chapter- and topic-specific multiple-choice questions based on the unique assessment plan for the Class 12 Chemistry Case Study Questions Board Examination.

Chemistry Syllabus for 2024

Unit II: Solutions (15 Periods)

Types of solutions, expression of concentration of solutions of solids in liquids, solubility of gases in liquids, solid solutions, Raoult’s law, colligative properties – relative lowering of vapour pressure, elevation of boiling point, depression of freezing point, osmotic pressure, determination of molecular masses using colligative properties, abnormal molecular mass, Van’t Hoff factor.

Unit III: Electrochemistry (18 Periods)

Redox reactions, EMF of a cell, standard electrode potential, Nernst equation and its application to chemical cells, Relation between Gibbs energy change and EMF of a cell, conductance in electrolytic solutions, specific and molar conductivity, variations of conductivity with concentration, Kohlrausch’s Law, electrolysis and law of electrolysis (elementary idea), dry cell-electrolytic cells and Galvanic cells, lead accumulator, fuel cells, corrosion.

Unit IV: Chemical Kinetics (15 Periods)

Rate of a reaction (Average and instantaneous), factors affecting rate of reaction: concentration, temperature, catalyst; order and molecularity of a reaction, rate law and specific rate constant, integrated rate equations and half-life (only for zero and first order reactions), concept of collision theory (elementary idea, no mathematical treatment), activation energy, Arrhenius equation.

Unit VIII: d and f Block Elements (18 Periods)

General introduction, electronic configuration, occurrence and characteristics of transition metals, general trends in properties of the first-row transition metals – metallic character, ionization enthalpy, oxidation states, ionic radii, colour, catalytic property, magnetic properties, interstitial compounds, alloy formation, preparation and properties of K 2 Cr 2 O 7  and KMnO 4 .

Lanthanoids –  Electronic configuration, oxidation states, chemical reactivity and lanthanoid contraction and its consequences.

Actinoids –  Electronic configuration, oxidation states and comparison with lanthanoids.

Unit IX: Coordination Compounds (18 Periods)

Coordination compounds – Introduction, ligands, coordination number, colour, magnetic properties and shapes, IUPAC nomenclature of mononuclear coordination compounds. Bonding, Werner’s theory, VBT, and CFT; structure and stereoisomerism, the importance of coordination compounds (in qualitative analysis, extraction of metals and biological system).

Unit X: Haloalkanes and Haloarenes (15 Periods)

Haloalkanes:  Nomenclature, nature of C–X bond, physical and chemical properties, optical rotation mechanism of substitution reactions.

Haloarenes:  Nature of C–X bond, substitution reactions (Directive influence of halogen in monosubstituted compounds only). Uses and environmental effects of – dichloromethane, trichloromethane, tetrachloromethane, iodoform, freons, DDT.

Unit XI: Alcohols, Phenols and Ethers (14 Periods)

Alcohols:  Nomenclature, methods of preparation, physical and chemical properties (of primary alcohols only), identification of primary, secondary and tertiary alcohols, mechanism of dehydration, uses with special reference to methanol and ethanol.

Phenols:  Nomenclature, methods of preparation, physical and chemical properties, acidic nature of phenol, electrophilic substitution reactions, uses of phenols.

Ethers:  Nomenclature, methods of preparation, physical and chemical properties, uses.

Unit XII: Aldehydes, Ketones and Carboxylic Acids (15 Periods)

Aldehydes and Ketones:  Nomenclature, nature of carbonyl group, methods of preparation, physical and chemical properties, mechanism of nucleophilic addition, reactivity of alpha hydrogen in aldehydes, uses.

Carboxylic Acids:  Nomenclature, acidic nature, methods of preparation, physical and chemical properties; uses.

Unit XIII: Amines (14 Periods)

Amines:  Nomenclature, classification, structure, methods of preparation, physical and chemical properties, uses, identification of primary, secondary and tertiary amines

Diazonium salts:  Preparation, chemical reactions and importance in synthetic organic chemistry.

Unit XIV: Biomolecules (18 Periods)

Carbohydrates –  Classification (aldoses and ketoses), monosaccharides (glucose and fructose), D-L configuration oligosaccharides (sucrose, lactose, maltose), polysaccharides (starch, cellulose, glycogen); Importance of carbohydrates.

Proteins –  Elementary idea of – amino acids, peptide bond, polypeptides, proteins, structure of proteins – primary, secondary, tertiary structure and quaternary structures (qualitative idea only), denaturation of proteins; enzymes.

Hormones –  Elementary idea excluding structure.

Vitamins –  Classification and functions.

Nucleic Acids:  DNA and RNA.

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Class 12 Chemistry Previous Year Question Paper Set 1 (56/3/1) 2024

CBSE Class 12 Chemistry Question Paper Set 1 (56/3/1) 2024 With Solutions - FREE PDF Download

CBSE Class 12 Chemistry Question Paper Set 1 (56/3/1) 2024 is important for students preparing for their board exams. These papers give you a clear idea of the types of questions that have been asked, the exam pattern, and the difficulty level. The Class 12 Chemistry examination 2024 was considered a moderate-level paper, and the questions were prepared according to the CBSE Class 12 Chemistry Syllabus .

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Instructions to Follow - CBSE Class 12 Chemistry Question Paper Set 1 (56/3/1) 2024

(i) This question paper contains 33 questions. All questions are compulsory.

(ii) This question paper is divided into five sections – Section A, B, C, D, and E.

(iii) Section A – questions number 1 to 16 are multiple choice type questions. Each question carries 1 mark.

(iv) Section B – questions number 17 to 21 are very short answer-type questions. Each question carries 2 marks.

(v) Section C – questions number 22 to 28 are short answer type questions. Each question carries 3 marks.

(vi) Section D – questions number 29 and 30 are case-based questions. Each question carries 4 marks.

(vii) Section E – questions number 31 to 33 are long answer-type questions. Each question carries 5 marks.

(viii) There is no overall choice given in the question paper. However, an internal choice has been provided in a few questions in all the sections except Section A.

(ix) Kindly note that there is a separate question paper for Visually Impaired candidates.

(x) Use of calculators is not allowed.

Syllabus and Weightage of Units for CBSE Chemistry Class 12 - Exam 2024-25

Benefits of CBSE Class 12 Chemistry Question Paper Set 1 (56/3/1) 2024

Class 12 Chemistry Question Paper Set 1 (56/3/1) 2024 includes a wide range of topics. This helps students get a thorough understanding of what to expect in the actual exam.

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Solutions highlight the key topics and frequently asked questions. This helps students focus on important areas of the syllabus and prepare better for their exams.

The solutions provide model answers which can guide students on how to structure their responses. They learn the art of writing clear, concise, and well-organised answers.

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Class 12 Chemistry Question Paper Set 1 (56/3/1) 2024 is important for students preparing for their board exams. It helps them understand the exam format, manage time well, and focus on important topics. By practising with this paper and using the solutions, students can improve how they write answers, gain confidence, and understand their progress effectively. It's an important study material that supports thorough revision and better exam preparation.

Class 12 Chemistry Board Exam 2024 - Set Wise Question Paper

CBSE Previous Year Question Paper Class 12 Chemistry had 5 different sets of question papers. Each set had different questions but covered the same topics. Practising these set-wise papers helps students understand the exam format and improve their skills.

CBSE Class 12 Chemistry Year-wise Question Papers (2013-2023) 

Related Study Material Class 12 Chemistry

FAQs on Class 12 Chemistry Previous Year Question Paper Set 1 (56/3/1) 2024

1. Are the Chemistry Previous Year Question Paper Set 1 (56/3/1) 2024 useful for exam preparation?

Yes, they are very useful for understanding the exam pattern, the types of questions asked, and the marking scheme.

2. What are some key topics to focus on for the 2024 Chemistry exam?

Key topics include:

Electrochemistry

Coordination compounds

Organic chemistry (particularly reactions and mechanisms)

Chemical kinetics

Surface chemistry

3. How important is practising numerical problems in Chemistry Previous Year Question Paper Set 1 (56/3/1) 2024?

Practising numerical problems is crucial, especially for topics like electrochemistry, chemical kinetics, and thermodynamics, as they often carry significant weightage in the exam.

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Practice Chemistry Previous Year Question Paper Set 1 (56/3/1) 2024 within the stipulated time, prioritize answering high-mark questions first, and leave time at the end for revision.

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Case Study Questions for Class 12 Chemistry Chapter 15 Polymers

Case study questions for class 12 chemistry chapter 12 aldehydes, ketones and carboxylic acids, case study questions for class 12 chemistry chapter 4 chemical kinetics, case study questions for class 12 chemistry chapter 9 coordination compounds, case study questions for class 12 chemistry chapter 10 haloalkanes and haloarenes, case study questions for class 12 chemistry chapter 11 alcohols, phenols and ethers, case study questions for class 12 chemistry chapter 13 amines, case study questions for class 12 chemistry chapter 14 biomolecules, case study questions for class 12 chemistry chapter 8 the d- and f-block elements, case study questions for class 12 chemistry chapter 7 the p-block elements, case study questions for class 12 chemistry chapter 5 surface chemistry, case study questions for class 12 chemistry chapter 3 electrochemistry, case study questions for class 12 chemistry chapter 2 solutions, case study questions for class 12 chemistry chapter 1 the solid state.

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NCERT Solutions For Class 12 Chemistry Chapter 14 Biomolecules

September 25, 2020 by phani

NCERT Solutions For Class 12 Chemistry Chapter 14 Biomolecules

Topics and Subtopics in  NCERT Solutions for Class 12 Chemistry Chapter 14 Biomolecules :

NCERT INTEXT QUESTIONS

14.1. Glucose or sucrose are soluble in water but cyclohexane and benzene (simple six membred ring compounds) are insoluble in water Explain. Ans:  The .solubility of a solute in a given solvent follows the rule ‘ Like dissolves like’.Glucose contains five and sucrose contains eight -OH groups. These -OH groups form H-bonds with water. As a result of this extensive intermoleeular H-bonding, glucose and sucrose are soluble in water.On the other hand, benzene and cyclohexane do not contain -OH bonds and hence do not form H-bonds with water. Moreover, they are non-polar molecules and hence do not dissolve in polar water molecules.

14.4. The melting points and solubility in water of a-amino acids are generally higher than those of corresponding haloacids. Explain. Ans: a-amino acids as we all know, are dipolar in nature (\(\overset { + }{ N }\)H 3 -CHR-COO – ) and have strong dipolar interactions. As a result, these are high melting solids. These are also involved in intermolecular hydrogen bonding with the  molecules of water and are therefore, water soluble. On the contrary, the haloacids RCH(X)COOH are not dipolar like a-amino acids. Moreover, only the carboxyl group of haloacids are involved in hydrogen bonding with the molecules of water and not the halogen atoms. These have therefore, comparatively less melting points and are also soluble in water to smaller extent.

14.5. Where does the water present in the egg go after boiling the egg? Ans: When egg is boiled, proteins first undergo denaturation and then coagulation and the water present in the egg gets absorbed in coagulated protein, probably through H- bonding

14.6. Why cannot Vitamin C be stored in our body? Ans:   Vitamin C cannot be stored in the body because it is water soluble and is, therefore, easily excreted in urine.

14.7. Which products would be formed when a nucleotide from DNA containing thymine is hydrolysed? Ans:   Upon hydrolysis, nucleotide from DNA would form 2-deoxyribose and phosphoric acid along-with thymine.

14.8. When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of RNA? Ans: A DNA molecule has two strands in which the four complementary bases pair each other, i.e., cytosine (C) always pair with guanine (G) while thymine (T) always pairs with adenine (A). Thus, when a DNA molecule is hydrolysed, the molar amounts of cytosine is always equal to that of guanine and that of adenine is always equal to thymine.In RNA, there is no relationship between the quantities of four bases (C, G, A and U) obtained, therefore, the base pairing principle, i.e. A pairs with U and C pairs with G is not followed. Therefore, unlike DNA, RNA has a single strand.

NCERT EXERCISES

14.2. What are reducing sugars? Ans: Reducing sugars are those which can act as reducing agents. They contain in them a reducing group which may be aldehydic (-CHO) or ketonic (>C=0) group. The characteristic reactions of reducing sugars are with Tollen’s reagent and Fehling solution. Non-reducing sugars donot give these reactions. For example, glucose, fructose, lactose etc. are reducing sugars. Sucrose is regarded as a non-reducing sugar because both glucose and fructose are linked through their aldehydic and ketonic groups by glycosidic linkage. Since these groups are not free, sucrose is a non-reducing sugar.

14.3. Write two main functions of carbohydrates in plants. Ans: Two major functions of carbohydrates in plants are following (a)Structural material for plant cell walls: The polysaccharide cellulose acts as the chief structural material of the plant cell walls. (b)Reserve food material: The polysaccharide starch is the major reserve food material in the plants. It is stored in seeds and act as the reserve food material for the tiny plant till it is capable of making its own food by photosynthesis.

14.4. Classify the following into monosaccharides and disaccharides. Ribose, 2-deoxyribose, maltose, galactose, fructose and lactose. Ans: Monosaccharides: Ribose, 2-deoxyribose, galactose and fructose. Disaccharides: Maltose and lactose.

14.6. What is glycogen? How is it different from starch? Ans: The carbohydrates are stored in animal body as glycogen. It is also called animal starch and its structure is similar toamylopectin which means that it is a branched chain polymer of α-D-glucose units in which the chain is formed by C 1 – C 4 glycosidic linkage whereas branching occurs by the formation of C 1 – C 6 glycosidic linkage. One main difference between glycogen and amylopectin is the length of the chain. In amylopectin, the chain consists of 20 – 25 α – D – glucose molecules whereas in glycogen, there are 10 -14 molecules of α – D – glucose present. Glycogen is more branched than amylopectin. It is present mainly in liver, muscles and also in brain. Glycogen gets converted into glucose when the body needs it with the help of certain enzymes present in the body. Glycogen has also been found to be present in yeast and fungi.

Starch is a major source of carbohydrates which are very much essential to the human body since they supply energy to the body. It occurs as granules mainly in seeds, fruits, tubers and also in the roots of the plants. The chief commercial sources of starch are wheat, maize, rice, potatoes etc.

14.10. Enumerate the reactions of D-glucose which cannot be explained with open chain structure. (C.B.S.E. Delhi 2008, C.B.S.E. Sample Paper 2011) Ans: Open chain structure of D-glucose contains a free aldehydic group (- CHO). However, it does not give the following reactions:

• D(+) glucose does not react with 2, 4 D.N.P.
• D(+) glucose does not react with NaHSO 3 .
• D(+) glucose does not restore the pink colour to Schiff’s reagent.
• Penia acetyl glucose formed by carrying acetylation with acetic anhydride does not react with hydroxyl amine (NH 2 OH) which is the characteristic reaction of all aldehydes.
• D( +) glucose is found to exist in two different crystalline forms which are named as α and β. Both these forms have actually been isolated. For example, α form with m.p. 419 K is obtained by the crystallisation of the saturated solution of glucose prepared at 303 K. Similarly, β-form with m.p. 423 K is isolated by carrying out the crystallisation of the saturated solution of glucose prepared at 371 K. Apart from that the a-form has a specific rotation (α) equal to + 112° while the β- form has specific rotation (α) equal to + 19°.

14.11. What are essential and non-essential amino acids? Give two examples of each type. Ans: α-Amino acids which are needed for good health and proper growth of human beings but are not synthesized by the human body are called- essential amino acids. For example, valine, leucine, phenylalanine, etc. On the other hand, α-amino acids which are needed for health and growth of human beings and are synthesized by the human body are called non-essential amino acids. For example, glycine, alanine, aspartic acid etc.

14.13. What are the common types of secondary structure of proteins? Ans: Secondary structure of protein refers to the shape in which a long polypeptide chain can exist. These are found to exist in two types :

• α-helix structure
• β-pleated sheet structure.

Secondary Structure of Proteins: The long, flexible peptide chains of proteins are folded into the relatively rigid regular conformations called the secondary structure. It refers to the conformation which the polvpeptide chains assume as a result of hydrogen bonding between the > C= O and > N-H groups of different peptide bonds. The type of secondary structure a protein will acquire, in general depends upon the size of the R-group. If the size of the R-groups are quite large, the protein will acquire ct-helix structure. If on the other hand, the size of the R-groups are relatively smaller, the protein will acquire a β – flat sheet structure.

(b) β—Flat sheet or β—Pleated sheet structure: If R-groups are relatively small, the peptide chains lie side by side in a zig zag manner with alternate R-groups on the same side situated at fixed distances apart. The two such neighbouring chains are held together by intermolecular hydrogen bonds. A number of such chains can be inter-bonded and this results in the formation of a flat sheet structure These chains may contract or bend a little in order to accommodate moderate sized R-groups. As a result, the sheet bends into parallel folds to form pleated sheet structure known as β – pleated sheet structure. These sheets are then stacked one above the other like the pages of a book to form a three dimensional structure. The protein fibrion in silk fibre has a β – pleated sheet structure. The characteristic mechanical properties of silk can easily be explained on the basis of its β – sheet structure. For example, silk is non-elastic since stretching leads to pulling the peptide covalent bonds. On the other hand, it can be bent easily like a stack of pages because during this process, the sheets slide over each other.

14.14. What types of bonding helps in stabilising the α-helix structure of proteins? Ans: α-helix structure of proteins is stabilised through hydrogen bonding. (a) α -Helix structure. If the size of the R-groups are quite large, the hydrogen bonding occurs between > C = O group of one amino acid unit and the > N- H group of the fourth amino acid unit within the same chain. As such the polypeptide chain coils up into a spiral structure called right handed a—helix structure. This type of structure is adopted by most of the fibrous structural proteins such as those present in wool, hair and muscles. These proteins are elastic i.e., they can be stretched. During this process, the weak hydrogen bonds causing the α-helix are broken. This tends to increase the length of the helix like a spring. On releasing the tension, the hydrogen bonds are reformed, giving back the original helical shape.

14.15: Differentiate between globular and fibrous proteins. Ans. (i) Fibrous proteins: These proteins consist of linear thread like molecules which tend to lie side by side (parallel) to form fibres. The polypeptide chains in them are held together usually at many points by hydrogen bonds and some disulphide bonds. As a result,intermolecular forces of attraction are very’ strong and hence fibrous proteins are insoluble in water. Further, these proteins are stable to moderate changes in temperature and pH. Fibrous proteins serve as the chief structural material of animal tissues.For example, keratin in skin, hair, nails and wool, collagen in tendons, fibrosis in silk and myosin in muscles. (ii) Globular proteins: The polypeptide chain in these proteins is folded around itself in such a way so as to give the entire protein molecule an almost spheroidal shape. The folding takes place in such a manner that hydrophobic (non-polar) parts are pushed inwards and hydrophilic (polar) parts are pushed outwards. As a result, water molecules interact strongly with the polar groups and hence globular protein are water soluble. As compared to fibrous proteins, these are very sensitive to small changes of temperature and pH. This class of proteins include all enzymes, many hormones such as insulin from pancreas, thyroglobulin from thyroid gland, etc.

14.17. What are enzymes? Ans: Enzymes are biological catalyst. Each biological reaction requires a different enzyme. Thus, as compared to conventional catalyst enzymes are very specific and efficient in their action. Each type of enzyme has its own specific optimum conditions of concentration, pH and temperature at which it works best.

14.18. What is the effect of denaturation on the structure of proteins? Ans: Denaturation of proteins is done either by change in temperature (upon heating) or by bringing a change in the pH of the medium. As a result, the hydrogen bonding is disturbed and the proteins lose their biological activity i.e., their nature changes. During the denaturation, both the tertiary and secondary structures of proteins are destroyed while the primary structures remain intact.

14.19. How are vitamins classified? Name the vitamin responsible for the coagulation of blood. Ans: Vitamins are classified into two groups depending upon their solubility in water or fat: (i) Water soluble vitamins: These include vitamin B-complex (B 1 , B 2 , B 5 , i.e., nicotinic acid,B 6 , B 12 , pantothenic acid, biotin, i.e., vitamin H and folic acid) and vitamin C. (ii) Fat soluble vitamins: These include vitamins A, D, E and K. They are stored in liver and adipose (fat storing) tissues. Vitamin K is responsible for coagulation of blood.

14.20. Why are vitamin A and vitamin C essential to us? Give their important sources. Ans: Vitamin A is essential for us because its deficiency causes xerophthalmia (hardening of cornea of eye) and night blindness. Sources: Fish liver oil, carrots, butter, milk, etc. Vitamin C is essential for us because its deficiency causes scurvy (bleeding of gums) and pyorrhea (loosening and bleeding of teeth). Sources: Citrous fruits, amla, green leafy vegetables etc.

14.23. The two strands in DNA are not identical but are complementary. Explain. Ans:   The two strands in DNA molecule are held together by hydrogen bonds between purine base of one strand and pyrimidine base of the other and vice versa. Because of different sizes and geometries of the bases, the only possible pairing in DNA are G (guanine) and C (cytosine) through three H-bonds, (i.e.,C = G) and between A (adenine) and T (thiamine) through two H-bonds (i.e., A = T). Due to this base -pairing principle, the sequence of bases in one strand automatically fixes the sequence of bases in the other strand. Thus, the two strands are complimentary and not identical.

14.25. What are the different types of RNA found in the cell? Ans: There are three types of RNA: (a) Ribosomal RNA (r RNA) (b) Messenger RNA (m RNA) (c) Transfer RNA (t RNA)

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Biomolecules Class 12 Chemistry Important Questions

Students can read the important questions given below for Biomolecules Class 12 Chemistry. All Biomolecules Class 12 Notes and questions with solutions have been prepared based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS. You should read all notes provided by us and Class 12 Chemistry Important Questions provid ed for all chapters to get better marks in examinations. Chemistry Question Bank Class 12 is available on our website for free download in PDF.

Important Questions of Biomolecules Class 12

Very short answer questions.

Question.  Write the product obtained when D-glucose reacts with H 2 N—OH.  Answer.  D-Glucose reacts with H 2 N—OH to give glucose oxime.

Question.  Which one of the following is a monosaccharide : starch, maltose, fructose, cellulose Answer. Fructose is a monosaccharide because it cannot be hydrolysed to simpler polyhydroxy aldehydes or ketones.

Question.  Write the name of two monosaccharides obtained on hydrolysis of lactose sugar. Answer.  Lactose on hydrolysis gives β-D-glucose and β-D-galactose.

Question.  Write the name of the vitamin whose Deficiency causes bleeding of gums.  Answer.  Vitamin C

Question.  Write the structural difference between starch and cellulose. Answer. The basic structural difference between starch and cellulose is of linkage between the glucose units. In starch, there is a-D-glycosidic linkage. Both the components of starch-amylose and amylopectin are polymer of a-D-glucose. On the other hand, cellulose is a linear polymer of b-D-glucose in which C 1 of one glucose unit is connected to C 4 of the other through β-D-glycosidic linkage.

Question.  Write the structure of the product obtained when glucose is oxidised with nitric acid. Answer. On oxidation with nitric acid, D – glucose yields saccharic acid.

Question.  Write a reaction which shows that all the carbon atoms in glucose are linked in a straight chain. Answer. Glucose when heated with red P and HI gives n-hexane.

It indicates presence of straight chain of six carbon atoms in glucose.

Question.  Which one of the following is a disaccharide : Starch, Maltose, Fructose, Glucose? Answer.  Maltose is a disaccharide as it consists of two a-D-glucose units.

Question.  Define the following term : Polysaccharides  Answer.  Carbohydrates which yield a large number of monosaccharide units on hydrolysis are called polysaccharides.

Question.  Why Vitamin C cannot be stored in our body? Answer.  Vitamin C is soluble in water and regularly excreted in urine and hence cannot be stored in body.

Question.  Deficiency of which vitamin causes nightblindness? Answer.  Vitamin A

Question.  Which of the two components of starch is water soluble? Answer.  Amylose is water soluble and amylopectin is insoluble in water.

Question.  What is meant by ‘reducing sugars’? Answer.  Carbohydrates which reduce Tollen’s reagent are reducing sugars. All monosaccharides, aldoses or ketoses are reducing sugars.

Question.  Define the following term : Vitamins Answer.  Organic compounds required in the diet in small amounts to perform specific biological functions for normal maintainance of optimum growth and health of the organism are called vitamins.

Question.  Why are vitamin A and vitamin C essential for us?  Answer.  The deficiency of vitamin A leads to xerophthalmia and night blindness. The deficiency of vitamin C leads to scurvy.

Question.  Write the name of vitamin whose Deficiency causes bone deformities in children. Answer.  Vitamin D

Question.  What are the products of hydrolysis of sucrose? Answer.  Glucose and fructose.

Question.  What is the structural feature characterising reducing sugar? Answer.  The reducing sugars have free aldehydic or ketonic groups.

Question.  Give one example each for fibrous protein and globular protein. Answer.  Globular protein – Insulin Fibrous protein – Keratin

Question.  Name two components of starch. Answer.  Amylose and amylopectin are the two components of starch.

Question.  Mention the structural feature characterising reducing sugar. Answer.  Reducing sugar : The sugars which reduce Fehling’s solution and Tollen’s reagent are called reducing sugars. For example, all monosaccharides

Question.  Write the product formed on reaction of D-glucose with Br 2 water. Answer.  D – Glucose gets oxidised to six carbon carboxylic acid (gluconic acid) on reaction with bromine water.

Question.  Write the product formed when glucose is treated with HI. Answer. On prolonged heating with HI, D-Glucose forms n-hexane.

Short Answer Questions

Question.  Aer watching a programme on TV about the adverse effects of junk food and so drinks on the health of school children, Sonali, a student of Class XII, discussed the issue with the school principal. Principal immediately instructed the canteen contractor to replace the fast food with the bre and vitamins rich food like sprouts, salad, fruits etc. This decision was welcomed by the parents and the students. Aer reading the above passage, answer the following questions : (a) What values are expressed by Sonali and the Principal of the school? (b) Give two examples of water-soluble vitamins. Answer.  (a) Awareness and social thinking (b) Vitamin B complex and vitamin C.

Question.  What is a glycosidic linkage? Answer.  The two monosaccharides are joined together by an oxide linkage formed by the loss of water molecule. Such linkage is called glycosidic linkage

Question.  What is the difference between fibrous protein and globular protein? Answer.  Characteristic differences between globular and fibrous proteins can be given as :

Question.  Answer the following question briefly : How are carbohydrates classified? Answer.  On the basis of hydrolysis, carbohydrates can be divided in three major classes : (i) Monosaccharides : These cannot be hydrolysed into simpler molecules. These are further classied as aldoses and ketoses. (ii) Oligosaccharides : These are the carbohydrates which on hydrolysis give 2 – 10 monosaccharides. For example, sucrose, lactose, maltose, etc. (iii) Polysaccharides : These are high molecular mass carbohydrates which give many molecules of monosaccharides on hydrolysis. For example starch and cellulose.

Question.  How are the vitamins classified? Mention the chief sources of vitamins A and C. Answer.  Vitamins are classied into two groups depending upon their solubility in water or fat. (i) Fat soluble vitamins. (ii) Water soluble vitamins. Sources of vitamin A : Fish, liver oil, carrots, butter and milk. Sources of vitamin C : Citrus fruits, amla and green leafy vegetables.

Question.  B-complex is an oen prescribed vitamin. What is complex about it and what is its usefulness? Answer.  B-complex is a group of vitamins which contains vitamins B 1 , B 2 , B 6 , B 12 , biotin, folic acid, pantothenic acid and nicotinic acid. It is required to release energy from food and to promote healthy skin and muscles. Its deciency causes beri beri and pernicious anaemia.

Question.  Write the structural and functional difference between DNA and RNA. Answer.  Structural differences between DNA and RNA (i) The sugar in DNA is deoxyribose while that in RNA is ribose. (ii) DNA has a double-stranded helical structure, while RNA has a single-stranded helical structure. Functional differences between DNA and RNA (i) DNA is the chemical basis of heredity and is responsible for maintaining the identity of different species. (ii) RNA molecules are responsible for protein synthesis but the message for the synthesis of a particular protein is present in DNA

Question.  Name the bases present in RNA. Which one of these is not present in DNA? Answer.  The bases present in RNA are adenine (A), guanine (G) cytosine (C) and

Question.  What are essential and non-essential amino acids? Give one example of each type. Answer.  Amino acids which cannot be synthesised in the body and must be obtained through diet are known as essential amino acids, e.g., valine and leucine. There are ten essential amino acids. Amino acids which can be synthesised in the body are known as non-essential amino acids, e.g., alanine and glutamic acids.

Long Answer Questions

Question.  What is essentially the difference between a-form and b-form of glucose? Explain. Answer.  In a-D Glucose, the –OH group at C 1 is towards right whereas in b-glucose, the –OH group at C 1 is towards le. Such a pair of stereoisomers which differ in the configuration only at C 1 are called anomers.

Question.  Define the following term : Anomers  Answer.  The pair of stereoisomers which differ only in the configuration of the hydroxyl group at C 1 are called anomers.

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12th Chemistry Biomolecules Chapter Case Study Question with Answers CBSE

By QB365 on 13 Jan, 2024

Biomolecules

Biomolecules Chapter Case Study Question with Answers

12th Chemistry CBSE case study questions for Biomolecules - 2024

CBSE 12th Chemistry Biomolecules Case Study Question & Answers 

CBSE 12th Chemistry Biomolecules Chapter Case Study Question with Answers

CBSE Class 12th Chemistry Sample Model Question Papers. CBSE Class 12th Chemistry Sample Case Study Questions with Answer Keys. CBSE 12th Chemistry Model Question Papers Case Study Questions CBSE 12th Chemistry CBSE Case Study Question and Answers CBSE 12th Chemistry CBSE Question Papers with Answer Keys Model Question Paper 12th Chemistry with Answer Keys Biomolecules 12th CBSE Chemistry Question Papers with Answer Keys. Model Question Paper for 12th Chemistry CBSE CBSE Model Question Papers Class 12th  2024 Model Question Paper 12th Chemistry 

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CBSE Class 12 Biology Competency-Based Questions With Answer Key 2024-25: Chapter 3 Ecosystem FREE PDF Download!

Cbse class 12 maths chapter 1 practice questions 2025: the 2024-25 competency-based questions for cbse class 12 biology chapter 3 ecosystem is given here. check and download the mcqs and free response questions in pdf format..

CBSE 2024-25 Competency-Based Questions With Answers: Assessment is a part of learning that leads to the foundation of knowledge gained by the students throughout the course. The assessment can be of multiple types depending on the kinds of skills that it aims to analyse. One type of assessment is competency-based and these questions are framed in such a manner that they can assess the understanding of the students on a particular topic with the help of various aspects. 

The Central Board Of Secondary Education has released the 2024-25 competency-based questions for classes 12 and if the students want to take a look at it, then we will be providing the questions with answers and that too chapter-wise. 

CBSE Class 12 Biology Chapter 3 Ecosystem Competency-Based Questions

Free Response Question / Subjective Question 

1. State ONE quality that a pioneer species must have.

What are Competency-based Questions For Class 12 Biology For The 2024-25 Exams?

Tips to prepare for cbse class 12 biology exam.

Are you also looking for some tips to prepare for the class 12 Biology exam? 

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Try to practise and learn by dividing the concepts into small chunks. This will help you to understand complex topics easily and also prepare for them. 

CHECK: CBSE Class 12 Biology Competency-Based Questions With Answer Key 2024-25

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