CBSE Class 12 Chemistry Question Paper 2021 Set 01 Solved

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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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Download CBSE Class 12 Chemistry Question Paper 2021 Set 01 Solved for Class 12 Chemistry

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Are the solutions for CBSE Class 12 Chemistry Question Paper 2021 Set 01 Solved based on the official CBSE marking scheme?

Yes, the solutions for CBSE Class 12 Chemistry Question Paper 2021 Set 01 Solved are prepared by subject matter experts as per official marking scheme. Class 12 students will understand the structure of answers and 'step-marks' methodology Chemistry.

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Yes, where applicable, CBSE Class 12 Chemistry Question Paper 2021 Set 01 Solved is available in both English and Hindi mediums. All students from Class 12 can access Chemistry study material in their preferred language.

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