CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A

Access and download CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A, carefully designed as per the latest 2025-26 examination guidelines issued by CBSE, NCERT, and KVS. These Class 12 Chemistry previous year question papers include detailed solutions, helping students to assess their performance and identify and improve key areas before the final exams.

Solved Chemistry Question Papers for Class 12

Practicing these Class 12 Chemistry question papers is the best way to understand the actual exam pattern and marking scheme. By solving these papers under timed conditions, Class 12 students can improve their speed and accuracy. Download the full CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A to begin your self-assessment today.

Chemistry Class 12 Question Paper PDF with Solutions

SECTION A
Read the given passage and answer the questions number 1 to 5 that follow :
 
The substitution reaction of alkyl halide mainly occurs by SN1 or SN2 mechanism. Whatever mechanism alkyl halides follow for the substitution reaction to occur, the polarity of the carbon halogen bond is responsible for these substitution reactions. The rate of SN1 reactions are governed by the stability of carbocation whereas for SN2 reactions steric factor is the deciding factor. If the starting material is a chiral compound, we may end up with an inverted product or racemic mixture depending upon the type of mechanism followed by alkyl halide. Cleavage of ethers with HI is also governed by steric factor and stability of carbocation, which indicates that in organic chemistry, these two major factors help us in deciding the kind of product formed.
 
1. Predict the stereochemistry of the product formed if an optically active alkyl halide undergoes substitution reaction by SN1 mechanism.
 
2. Name the instrument used for measuring the angle by which the plane polarised light is rotated.
 
3. Predict the major product formed when 2-Bromopentane reacts with alcoholic KOH.
 
4. Give one use of CHI3.
 
5. Write the structures of the products formed when anisole is treated with HI.
 
Questions number 6 to 10 are one word answers :

6. Identify which liquid will have a higher vapour pressure at 900C if the boiling points of two liquids A and B are 1400C and 1800C, respectively.
 
7. Out of zinc and tin, whose coating is better to protect iron objects ?
 
8. Will the rate constant of the reaction depend upon T if the Eact (activation energy) of the reaction is zero ?
 
9. Give the structure of the monomer of PVC.
 
10. Which structural unit present in a detergent makes it non-biodegradable ?
 
Questions number 11 to 15 are multiple choice questions :
 
11. Out of the following, the strongest base in aqueous solution is
 
(A) Methylamine
 
(B) Dimethylamine
 
(C) Trimethylamine
 
(D) Aniline
 
12. Iodoform test is not given by
 
(A) Ethanol
 
(B) Ethanal
 
(C) Pentan-2-one
 
(D) Pentan-3-one
 
13. Out of the following transition elements, the maximum number of oxidation states are shown by
 
(A) Sc (Z = 21)
 
(B) Cr (Z = 24)
 
(C) Mn (Z = 25)
 
(D) Fe (Z = 26)
 
14. Hardening of leather in tanning industry is based on
 
(A) Electrophoresis
 
(B) Electro-osmosis
 
(C) Mutual coagulation
 
(D) Tyndall effec
Please click on below link to download CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A.

CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A

To understand the types of questions asked in past examinations, it is very important for Class 12 students to solve the CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A provided above. You can easily download these past papers for Class 12 Chemistry in PDF format for the last 10 years. By practicing these actual exam questions you will gain an understanding of the difficulty level and the variety of topics covered over the years. By solving these Previous Year Papers (PYPs) you will understand both descriptive and MCQ questions in your final tests.

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Regularly practicing CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A is the best way to improve your score in Class 12 Chemistry. These papers will give you details of the marking scheme and the paper structure used by the CBSE. By regularly attempting these under actual exam conditions at home, you can slowly improve your time management skills, which will help you to complete your Chemistry paper within the allowed duration.

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