CBSE Class 12 Chemistry Question Paper 2021 Set A Solved

Read and download CBSE Class 12 Chemistry Question Paper 2021 Set A Solved designed as per the latest question paper pattern and Class 12 examination guidelines issued by CBSE, NCERT and KVS. The past year Question Papers for Class 12 Chemistry have been provided with solutions which will help students to assess their performance and find out topics in Chemistry Class 12 which they need to improve to get better marks in Class 12 exams. After solving these last year papers also refer to solved Sample Papers for Class 12 Chemistry available on our website to build strong understanding of the subject

Chemistry Question Paper Class 12

Students can refer to the below Class 12 Chemistry Question Paper designed to help students understand the pattern of questions that will be asked in Class 12 exams. Please download CBSE Class 12 Chemistry Question Paper 2021 Set A Solved

Chemistry Class 12 Question Paper

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?


Please click on below link to download CBSE Class 12 Chemistry Question Paper 2021 Set A Solved

CBSE Class 12 Chemistry Question Paper 2021 Set A Solved

We hope you liked the above provided CBSE Class 12 Chemistry Question Paper 2021 Set A Solved. To get an understanding of the type of questions which were asked in previous year exams, it is important for Class 12 students to refer to CBSE Class 12 Chemistry Question Paper 2021 Set A Solved that we have provided above. Students can download all the Question Papers for Class 12 Chemistry which were issued in the exams so that you can practise them and solve all types of questions which have been asked till now. By doing all CBSE Class 12 Chemistry Question Paper 2021 Set A Solved PYP (previous year papers) you will understand the regular questions and MCQ questions for Class 12 Chemistry which are always asked and learn them so that you can get full marks in those questions. You can download CBSE Class 12 Chemistry Previous Year Question Papers and Class 12 Chemistry Sample Papers in PDF. You should attempt all the last year question paper for Class 12 and Class 12 Chemistry MCQ Test in examination conditions at home and then compare their answers with the solutions provided by our teachers.
 

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