CBSE Class 12 Chemistry Question Paper 2021 Set A Solved

Access and download CBSE Class 12 Chemistry Question Paper 2021 Set A Solved, 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 Question Paper 2021 Set A Solved to begin your self-assessment today.

Chemistry Class 12 Question Paper PDF with Solutions

Section -A
 
1. The dissolution of ammonium chloride in water is an exothermic process, but still it dissolves in water readily. Why?
OR
Addition of mercuric iodide to an aqueous solution of KI shows increase in vapour pressure. Why?
 
2. Allyl cholride can be distinguished from Vinyl chloride by NaOH and silver nitrate test. Comment.
 
3. How much charge in Faradays is required for the reduction of 1 mol of Al3+ to Al.
OR
The products of electrolysis of aqueous NaCl at the respective electrodes are :
Cathode : H2 ,Anode : Cl2 and not O2. Explain.
 
4. Define the term antagonists. 
 
5. What is Hinsberg reagent. Give its use. 
 
Section -B
 
6. What is the basic structural difference between
a) DNA and RNA
b) α-D glucose and β-D glucose
7. a) Write the IUPAC name of 
CBSE Class 12 Chemistry Question Paper 2021 Set A Solved 1
b) Draw the structure of Di-Sec-butylketone.
 
8. Write short note on
a) Zaitsev rule
b) Racemisation
OR
Explain the following with example
a) Wurtz Fittig reaction
b) Freons
 
9. a) For a reaction A + B →Products, the rate law is given by r = k [A]1/2 [B]2 What is the order of reaction.
b) The conversion of molecule X to Y follows second order kinetics. If concentration of X is increased to three times how will it affect the rate of the reaction?
 
10. How do we separate two sulphide ores by froth floatation process? Explain with an example. 
 
11. a) Give a chemical test to distinguish aniline and N-methyl aniline.
b) Arrange the following in decreasing order of pKb values :
C2H5NH2, C6H5NHCH3, (C2H5)2NH and C6H5NH2
OR
Write the structures of main products when benzene diazonium chloride reacts with the following reagents
(i) H3PO2 +H2O
(ii) CuCN/KCN
 
12. What is the difference between thermosetting polymers and thermoplastics. Give one Example of each type
 
Section -C
 
13. Account for the following
a) Frenkel defects are not found in alkali metal halides.
b) The electrical conductivity of a metal decreases with rise in temperature.
c) Impurity doped silicon is a semiconductor.
 
14. The density of lead is 11.35 g/cm3and the metal crystallises with fcc unit cell. Estimate the radius of lead atom.
( GAM of lead =207g/mol)
 
15. a) What are azeotropes?
b) What type of deviation is shown by a mixture of ethanol and acetone? Give reason
c) Gas (A) is more soluble than gas (B)at the same temperature. Which of the two gases will have higher value of KH and why?


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CBSE Class 12 Chemistry Question Paper 2021 Set A Solved

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 Question Paper 2021 Set A Solved 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 Question Paper 2021 Set A Solved 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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