Download Bihar Board 12th Chemistry 2019 Question Paper with Full Solutions

What is the difference between physical and chemical changes?
A physical change affects only the form of a substance, not its chemical makeup. A chemical change creates a new substance with different properties.

Why is water considered a universal solvent?
Because it can dissolve a wide range of substances due to its polarity, making it useful in many chemical reactions.

What are acids and bases?
Acids taste sour and turn blue litmus red. Bases taste bitter and turn red litmus blue.

What happens during rusting of iron?
Iron reacts with moisture and oxygen in the air, forming a brownish layer called rust.

What is meant by pH value?
pH tells how acidic or basic a substance is. Lower pH means more acidic, higher means more basic.

Why are noble gases unreactive?
Because their outer shells are already full, they don’t need to react with other elements.

How is hydrogen gas prepared in the lab?
Hydrogen is made by reacting a metal like zinc with an acid like hydrochloric acid.

What is electrolysis?
It’s a process where electricity is used to break down a compound into simpler substances.

What is meant by alloy?
An alloy is a mixture of two or more metals to make the material stronger or resistant to corrosion.

What is the use of bleaching powder?
It is used to disinfect water, make clothes white, and in the paper industry.

Why does milk turn sour?
Because bacteria turn the sugar in milk into acid, which changes its taste and texture.

What is the role of a catalyst in a chemical reaction?
It speeds up the reaction without being used up in the process.

What are polymers?
Polymers are long chains made from small repeating units, used to make plastic and rubber.

What are hydrocarbons?
These are compounds made of hydrogen and carbon, commonly found in fuels.

What happens when magnesium is burned in air?
It burns with a bright white flame and forms a white powder called magnesium oxide.

What is the difference between evaporation and boiling?
Evaporation happens slowly at any temperature, boiling happens fast at a specific temperature.

Why does salt dissolve in water?
Because the water molecules pull apart the salt particles and spread them throughout.

What are isotopes?
Isotopes are atoms of the same element with different numbers of neutrons.

Why is carbon dioxide used in fire extinguishers?
Because it does not support burning and helps put out the fire by cutting off oxygen.

What is the importance of fertilizers?
Fertilizers provide essential nutrients to plants for better growth and higher crop yield.

What is corrosion?
Corrosion is the gradual destruction of metals when they react with air or moisture.

Why does baking soda make cakes fluffy?
It releases carbon dioxide when heated, which creates bubbles and makes the cake soft.

What is the function of hemoglobin in blood?
Hemoglobin carries oxygen from the lungs to other parts of the body.

What is the purpose of distillation?
To separate a mixture of liquids based on their boiling points.

How does soap clean greasy hands?
Soap breaks up the grease into small droplets that can mix with water and wash away.

What is meant by greenhouse gases?
These are gases that trap heat in the Earth’s atmosphere, like carbon dioxide and methane.

What are synthetic fibers?
Fibers made by humans using chemicals, such as nylon and polyester.

Why is copper a good conductor of electricity?
Because its electrons can move freely, allowing current to flow easily.

What are biodegradable substances?
These are materials that can break down naturally by bacteria or other living things.

What happens when an acid reacts with a base?
They cancel each other out and form salt and water, a process called neutralization.

What is meant by oxidation?
It’s a reaction where a substance gains oxygen or loses hydrogen.

Why does lime water turn milky when carbon dioxide is passed through it?
Because carbon dioxide reacts with lime water and forms a white solid.

What is the role of nitrogen in fertilizers?
Nitrogen helps plants grow leaves and keeps them green and healthy.

What are semiconductors used for?
They are used in electronics like computers and phones because they can conduct electricity under certain conditions.

Why are metals shiny?
Because they reflect light from their surface.

What is a chemical equation?
It’s a short way to show a chemical reaction using symbols and names of substances.

What happens during photosynthesis?
Plants make their food using sunlight, water, and carbon dioxide, and release oxygen.

Why are plastics harmful to the environment?
Because they take a very long time to break down and pollute land and water.

What is the difference between saturated and unsaturated hydrocarbons?
Saturated ones have only single bonds, while unsaturated ones have double or triple bonds.

What is the use of alcohol in medicines?
It is used as a disinfectant and solvent in making syrups and tonics.

What is meant by valency?
Valency is the number of electrons an atom can lose, gain or share to form a compound.

Why do gases have no fixed shape or volume?
Because their particles move freely and spread out to fill any space.

What are radioactive elements?
These are elements that release radiation as they break down into other elements.

What is the importance of water in chemical reactions?
Water acts as a medium and sometimes takes part in the reaction.

What are enzymes?
Enzymes are special proteins that speed up reactions in the body.

What happens when iron is dipped in copper sulfate solution?
Iron replaces copper and a reddish layer of copper forms on the iron.

Why is ammonia used in fertilizers?
Because it contains nitrogen which is vital for plant growth.

What is chromatography used for?
It is used to separate and identify different substances in a mixture.

Why are carbon compounds so many in number?
Because carbon can form long chains and rings, and bond with many elements.

What is the function of ozone in the atmosphere?
It protects us by absorbing harmful ultraviolet rays from the sun.

Recommended Indian Books for Bihar Board 12th Chemistry Question Paper 2019 Preparation

1. Modern’s ABC of Chemistry Class 12 – S.P. Jauhar, Modern Publishers
   This book offers a strong conceptual base with chapter-wise theory, solved examples, previous year board questions, and HOTS (High Order Thinking Skills) problems for board preparation.

2. Pradeep’s New Course Chemistry Class 12 – S.N. Dhawan & K.N. Bhatia, Pradeep Publications
   A detailed guide that blends textbook knowledge with in-depth explanations, solved and unsolved questions, and numerical exercises from past Bihar Board exams.

3. Together with Chemistry Class 12 – R.K. Gupta, Rachna Sagar Publications
   Designed with model test papers, previous year papers, and case-based questions, this book helps in mastering exam-oriented answering patterns.

4. GRB Chemistry Class 12 – O.P. Tandon, GRB Publications
   Well-known for its structured theory, problem-solving approach, and a wide range of conceptual questions, useful for understanding fundamental topics.

5. Xam Idea Chemistry Class 12 – VK Global Publications
   A student-friendly guide including chapter-wise theory, NCERT corner, topic-based MCQs, assertion-reason questions, and practice sets with solutions.

6. Arihant All in One Chemistry Class 12 – Arihant Experts, Arihant Publications
   Offers easy-to-understand theory, NCERT and board-based questions, and additional practice papers aligned with the Bihar Board format.

7. Lakhmir Singh’s Chemistry Class 12 – Lakhmir Singh & Manjit Kaur, S. Chand Publishing
   Presents simplified language, everyday examples, topic summaries, and a variety of exercises including fill in the blanks, match the following, and conceptual reasoning.

8. Super 20 Sample Papers Chemistry Class 12 – Arihant Experts, Arihant Publications
   Contains 20 full-length sample papers based on Bihar Board exam trends, along with OMR-based objective tests and stepwise solution guides.

9. Full Marks Chemistry Class 12 – Anupriya Dubey, Full Marks Pvt. Ltd.
   A helpful revision tool that includes complete NCERT coverage, exam tips, practice questions, and past board papers arranged chapter-wise.

10. Exam Idea Chemistry Class 12 – Editorial Board, New Saraswati House
    Focuses on exam-oriented preparation with model answers, board-specific patterns, previous years’ questions, and important topics highlighted.

11. CBSE Chapterwise Solved Papers Chemistry Class 12 – Arihant Experts, Arihant Publications
    Even though titled CBSE, it includes valuable concept-building material and previous board-style questions adaptable for Bihar Board students.

12. Oswaal Bihar Board Chemistry Question Bank Class 12 – Oswaal Editorial Board, Oswaal Books
    Covers topic-wise questions from past papers, includes mind maps, common errors, and a variety of question types such as very short answer, short answer, and long answer.

13. MBD Sure Shot Chemistry Class 12 – MBD Group
    Contains chapter snapshots, pointwise explanations, important terms, and a large number of short conceptual and descriptive questions.

14. Golden Chemistry Class 12 – New Age Publishers
    Known for concise chapter summaries, exam-focused theory, and solved model papers based on actual Bihar Board patterns.

15. Evergreen Self Study in Chemistry Class 12 – Evergreen Publications
    A revision-centric book with direct questions, true/false, fill in the blanks, and other board-type short question formats.

16. Target Bihar Board Chemistry Class 12 – Bharti Bhawan Publishers
    Specifically designed for Bihar Board students, it includes previous year questions, model papers, and important chapter-wise short notes.

17. Navneet Chemistry Digest Class 12 – Navneet Education Limited
    Contains simple explanations, solved board papers, and structured answers useful for last-minute revision and self-assessment.

18. Kiran Bihar Board Chemistry Previous Year Papers Class 12 – Kiran Prakashan
    A question bank covering more than 10 years of Bihar Board papers with detailed solutions and expected questions based on pattern analysis.

19. Sahitya Bhawan Chemistry Sample Papers Class 12 – Sahitya Bhawan Publications
    Contains sample test papers with time-bound formats, board-type questions, and a breakdown of marks distribution for better preparation.

20. Bharti Bhawan Chemistry Exam Scorer Class 12 – Bharti Bhawan Publishers
    Focused on exam scoring techniques, it includes frequently asked questions, board paper analysis, and chapter-end revisions.

Bihar Board 12th Chemistry Question Paper 2019: A Detailed Guide for Students

The Bihar Board 12th Chemistry Question Paper 2019 holds great value for students aiming to perform well in their board exams. Chemistry, being a conceptual subject, demands clarity of topics, regular practice, and an understanding of how questions are framed. This paper serves as a key resource for both revision and smart preparation.

The 2019 chemistry paper reflected a balanced combination of theoretical knowledge and practical understanding. Students found the questions to be aligned with the prescribed syllabus, making it an ideal model for future exam preparation. Many educators recommend using this paper not just for solving practice questions but also for analyzing the pattern and marks distribution.

The question paper was divided into different sections, including very short answer, short answer, and long answer questions. This structure helped assess the students’ grasp over definitions, applications, and problem-solving ability. The very short answer questions typically tested definitions and facts—like the meaning of terms such as electrolytes, acids, or isomers. These required direct and crisp answers.

Short answer questions in the 2019 paper focused more on application-based queries. For instance, questions like “Why does water act as a universal solvent?” or “State the role of a catalyst in a chemical reaction” required conceptual explanation rather than rote memorization. This part of the paper allowed students to demonstrate their depth of understanding.

Long answer questions carried the most weight and often included questions that required explanations with suitable reasoning. Topics such as electrochemistry, organic reactions, and coordination compounds were heavily featured. Expert teachers recommend paying close attention to these chapters when using the 2019 question paper for mock tests.

One of the major strengths of this paper was its adherence to the Bihar Board’s updated syllabus. It helped bridge the gap between classroom teaching and actual board evaluation standards. Students who practiced the 2019 question paper thoroughly often found themselves more confident in dealing with both objective and descriptive questions.

When using this question paper as a practice tool, students should focus on writing full-length answers within a set time limit. This not only helps improve time management but also simulates the real exam experience. Experts also advise students to underline key terms, write neatly, and maintain answer formats that reflect the Bihar Board’s expectations.

While studying the Bihar Board 12th Chemistry Question Paper 2019, it’s also helpful to review the marking scheme. Understanding how marks are awarded can guide students in prioritizing what to write and how to write it. Attempting this paper under exam conditions helps in identifying weak areas and improving them gradually.

Another useful tip is to pair this paper with concept-based books and sample papers. After solving it, students should compare their answers with model solutions or those given by teachers. Doing so reveals how well the content was understood and what areas still need refinement.

Practicing previous year papers, especially the 2019 Chemistry paper, is a proven strategy among top scorers. It not only improves academic performance but also boosts exam confidence. For students aiming for high scores in Bihar Board 12th Chemistry, this paper is more than a resource—it’s a roadmap to success.

FAQ for Bihar Board 12th Chemistry Question Paper 2019

What is the format of the Bihar Board 12th Chemistry Question Paper 2019?
The paper was divided into sections including very short answer, short answer, and long answer questions. It also included objective-type questions like multiple choice and fill in the blanks.

How many marks was the Chemistry paper worth in 2019?
The total marks for the Bihar Board 12th Chemistry exam 2019 were 70 for theory and 30 for practical, making it a total of 100 marks.

Was the 2019 Chemistry paper based on the NCERT syllabus?
Yes, the question paper was strictly based on the NCERT syllabus prescribed by the Bihar School Examination Board for Class 12.

Which chapters were most important in the 2019 Chemistry paper?
Chapters like Electrochemistry, Organic Chemistry, Coordination Compounds, and Chemical Kinetics carried significant weight in the exam.

Were there any numerical questions in the paper?
Yes, numerical questions were included in sections like Electrochemistry and Solutions, testing students’ understanding of concepts and their application.

Was the 2019 Chemistry paper considered difficult?
The difficulty level was moderate. Students with clear conceptual knowledge and regular practice found it manageable.

Can I use the 2019 paper for current year exam preparation?
Absolutely. The 2019 question paper is a great resource for understanding the question pattern, important topics, and practicing for time management.

Are questions from the 2019 paper repeated in later exams?
While exact questions may not be repeated, similar patterns and concepts are often used in later Bihar Board exams.

How can I download or get the Bihar Board 12th Chemistry 2019 paper?
You can find it in reference books or exam-focused guides that include previous year papers. Many coaching institutes also provide it during preparation.

Is solving the 2019 paper enough for scoring high in Chemistry?
Solving it is a good start, but to score high, students should also solve other previous year papers, sample tests, and revise the entire syllabus thoroughly.

What is the best way to practice using this paper?
Set a timer, create a real exam environment, and write full answers without looking at your notes. Afterward, self-evaluate or get feedback from a teacher.

Are the practical questions in the 2019 Chemistry paper useful for board practical exams?
Yes, the paper can give insight into common theory-based practical questions and help in preparing for viva or lab exams.

Does the 2019 paper include multiple-choice questions (MCQs)?
Yes, the paper included objective-type questions such as MCQs, match the following, and fill in the blanks, testing students’ foundational knowledge.

How much time was given to complete the 2019 Chemistry exam?
Students were given 3 hours to complete the theory paper.

What is the pass mark in the Bihar Board 12th Chemistry exam?
Students need to score at least 30% in both theory and practical separately to pass the subject.