CBSE Class 12 Chemistry Question Paper 2021 Set B Solved

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

Chemistry Class 12 Question Paper PDF with Solutions

Section -A
 
1. Write the structure of the amide which gives propanamine by Hoffmann bromamide reaction. 
 
2. Define the term agonists. 
 
3. 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?
 
4. 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.
 
5. Which compound in each of the following pair will react faster in SN1 reaction?
CH3CH=CHCl or CH2=CHCH2Cl
 
Section -B
 
6. a) Write the IUPAC name of the following
CH3CH(CHO)CH2CH=CH2
b) Draw the structure of 4-methoxy,N,N,dimethylaniline.
7. How do we separate two sulphide ores by froth floatation process? Explain with an example. 2
8. Explain the following
a) Peptide linkage
b) Pyranose structure of α- D (+)glucose
 
9. a) The specific rate of a reaction is 6.2x10-3molL-1s-1.what is the order of the reaction.
b) For a reaction 2A→products, change in pressure of A is 4.8 bar in 20 minutes. What will be the average rate of this reaction.
 
10. 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
a) H3PO2 +H2O
b) CuCN/KCN
 
11. Write short note on
a) Zaitsev rule
b) Racemisation
OR
Explain the following with example
a) Wurtz Fittig reaction
b) Freons
 
12. What is the difference between Homopolymers and Copolymers. Give one example of each type 2
 
Section - C
 
13. The density of lead is 11.35 g/cm3and the metal crystallizes with fcc unit cell. Estimate the radius of lead atom. Atomic mass of lead =207g/mol)
 
14. a) Give the significance of lattice points.
b) Explain why
(i) Amorphous solids are isotropic.
(ii) Ferrimagnetic substances show better magnetism than antiferromagnetic substances.
 
15. The freezing point of a solution containing 0.3 g of acetic acid in 30 g benzene is lowered by 0.450C. Calculate Van’t Hoff factor .(Kf for benzene = 5.12 K kg mol-1)
OR
The vapour pressures of pure liquids A and B are 450 and 750 mm of Hg at 350 K respectively. Find out the composition of the liquid mixture if total vapour pressure is 600 mm of Hg. Also find the composition of the vapours of these liquids in vapour phase.
 
16. Explain the role of
a) Lime stone in the extraction of iron
b) CO in the purification of nickel
c) SiO2 in the extraction of copper
 
17. 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?
 
18. a) Pick out the odd one from the following on the basis of their medicinal properties mentioning the reason:
Luminal, Seconal, Phenacetin, Equanil.
b) Give an example of a substance that can act as a disinfectant as well as antiseptic depending upon its concentration. (Specify concentration)
c) Name any two macromolecules chosen as drug targets.
OR
Classify the following drugs and give their functions
a) Terfenadine
b) Iproniazid
c) Ofloxacin
 
19. Suggest a mechanism for the dehydration of ethanol using conc.H2SO4 at 413K.
OR
Give reason for the following observations
a) Phenol is less acidic than 2-Fluoro phenol
b) Tert-butanol is more volatile than n-butanol
c) Di-tert-butyl ether cannot be prepared by Wiliamsons synthesis
 
20. Account for the following :
a) Aromatic amines are less basic than aliphatic amines
b) Acetylation of aniline reduces its activation effect
c) Nitration of aniline gives substantial amount of m-nitro aniline
 
21. Write Short note on
a) Glycosidic linkage
b) Anomers
c) Oligosaccharides
 
22. Write the name and structures of the monomers of
a) Buna N
b) Teflon
c) Dacron
OR
a) What is meant by biodegradable polymers?
b) A biodegradable polymer is used in speciality packaging, orthopaedic devices and in controlled release of drugs. Identify the polymer and give its structure
 
23. Write equations for the following name reactions:
a) Gattermann - Koch reaction.
b) Stephen reaction.
c) Hell Volhard Zelinsky reaction
 
24. What happens when
a) Chlorobenzene is subjected to hydrolysis
b) Propene is treated with Cl2 in the presence of U.V. light / heated.
c) Alkyl chlorides when treated with NaI in dry acetone


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

2024
CBSE Class 12 Chemistry Question Paper 2024 Solved
2023
CBSE Class 12 Chemistry Question Paper 2023 Solved
2022
CBSE Class 12 Chemistry Question Paper 2022 Set A Solved
CBSE Class 12 Chemistry Question Paper 2022 Set B Solved
CBSE Class 12 Chemistry Question Paper 2022 Set C Solved
2021
CBSE Class 12 Chemistry Question Paper 2021 Set A Solved
CBSE Class 12 Chemistry Question Paper 2021 Set B Solved
CBSE Class 12 Chemistry Question Paper 2021 Set C Solved
2020
CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set A
CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set B
CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set C
CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set D
CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set E
CBSE Class 12 Chemistry Compartment Question Paper Solved 2020 Set A
CBSE Class 12 Chemistry Question Paper 2020 Set A
CBSE Class 12 Chemistry Question Paper 2020 Set B
CBSE Class 12 Chemistry Question Paper 2020 Set C Solved
CBSE Class 12 Chemistry Question Paper 2020 Set D Solved
CBSE Class 12 Commercial Art Compartment Question Paper 2020
2019
CBSE Class 12 Chemistry For Blind Question Paper Solved 2019
CBSE Class 12 Chemistry Question Paper Solved 2019 Set A
CBSE Class 12 Chemistry Question Paper Solved 2019 Set B
CBSE Class 12 Chemistry Question Paper Solved 2019 Set C
CBSE Class 12 Chemistry Question Paper Solved 2019 Set D
CBSE Class 12 Chemistry Question Paper Solved 2019 Set E
CBSE Class 12 Chemistry Question Paper Solved 2019 Set F
CBSE Class 12 Chemistry Question Paper Solved 2019 Set G
CBSE Class 12 Chemistry Question Paper Solved 2019 Set H
CBSE Class 12 Chemistry Question Paper Solved 2019 Set I
CBSE Class 12 Chemistry Question Paper Solved 2019 Set J
CBSE Class 12 Chemistry Question Paper Solved 2019 Set K
CBSE Class 12 Chemistry Question Paper Solved 2019 Set L
CBSE Class 12 Chemistry Question Paper Solved 2019 Set M
CBSE Class 12 Chemistry Question Paper Solved 2019 Set N
CBSE Class 12 Chemistry Question Paper Solved 2019 Set O
2018
CBSE Class 12 Chemistry Board Question Paper Solved 2018 Set 1
CBSE Class 12 Chemistry Board Question Paper Solved 2018 Set 2
CBSE Class 12 Chemistry Board Question Paper Solved 2018 Set 3
CBSE Class 12 Chemistry Compartment Question Paper Solved Solved 2018 Set 1
CBSE Class 12 Chemistry Compartment Question Paper Solved Solved 2018 Set 2
CBSE Class 12 Chemistry Compartment Question Paper Solved Solved 2018 Set 3
2017
CBSE Class 12 Chemistry Question Paper All India with answers 2017 (1)
CBSE Class 12 Chemistry Question Paper All India with answers 2017 (2)
CBSE Class 12 Chemistry Question Paper All India with answers 2017 (3)
CBSE Class 12 Chemistry Question Paper Delhi with answers 2017 (1)
CBSE Class 12 Chemistry Question Paper Delhi with answers 2017 (2)
CBSE Class 12 Chemistry Question Paper Delhi with answers 2017 (3)
CBSE Class 12 Chemistry Question Paper Foreign with answers 2017 (1)
CBSE Class 12 Chemistry Question Paper Foreign with answers 2017 (2)
CBSE Class 12 Chemistry Question Paper Foreign with answers 2017 (3)
2016
CBSE Class 12 Chemistry Question Paper 2016 Set 1 C
CBSE Class 12 Chemistry Question Paper 2016 Set 1 Delhi
CBSE Class 12 Chemistry Question Paper 2016 Set 1 E
CBSE Class 12 Chemistry Question Paper 2016 Set 1 Foreign
CBSE Class 12 Chemistry Question Paper 2016 Set 1 N
CBSE Class 12 Chemistry Question Paper 2016 Set 1 S
CBSE Class 12 Chemistry Question Paper 2016 Set 2 C
CBSE Class 12 Chemistry Question Paper 2016 Set 2 Delhi
CBSE Class 12 Chemistry Question Paper 2016 Set 2 E
CBSE Class 12 Chemistry Question Paper 2016 Set 2 Foreign
CBSE Class 12 Chemistry Question Paper 2016 Set 2 N
CBSE Class 12 Chemistry Question Paper 2016 Set 2 S
CBSE Class 12 Chemistry Question Paper 2016 Set 3 C
CBSE Class 12 Chemistry Question Paper 2016 Set 3 Delhi
CBSE Class 12 Chemistry Question Paper 2016 Set 3 E
CBSE Class 12 Chemistry Question Paper 2016 Set 3 Foreign
CBSE Class 12 Chemistry Question Paper 2016 Set 3 N
CBSE Class 12 Chemistry Question Paper 2016 Set 3 S
2015
CBSE Class 12 Chemistry Question Paper 2015 (Delhi Set 1) with Answers (Compartment)
CBSE Class 12 Chemistry Question Paper 2015 Delhi Set 1 (with answers) Reval
CBSE Class 12 Chemistry Question Paper 2015 (Delhi Set 2) with Answers (Compartment)
CBSE Class 12 Chemistry Question Paper 2015 Delhi Set 2 (with answers) Reval
CBSE Class 12 Chemistry Question Paper 2015 (Delhi Set 3) with Answers (Compartment)
CBSE Class 12 Chemistry Question Paper 2015 Delhi Set 3 (with answers) Reval
CBSE Class 12 Chemistry Question Paper 2015 (Outside Delhi Set 1) with Answers (Compartment)
CBSE Class 12 Chemistry Question Paper 2015 Outside Delhi Set 1 (with answers) Reval
CBSE Class 12 Chemistry Question Paper 2015 (Outside Delhi Set 2) with Answers (Compartment)
CBSE Class 12 Chemistry Question Paper 2015 Outside Delhi Set 2 (with answers) Reval
CBSE Class 12 Chemistry Question Paper 2015 (Outside Delhi Set 3) with Answers (Compartment)
CBSE Class 12 Chemistry Question Paper 2015 Outside Delhi Set 3 (with answers) Reval
2014
CBSE Class 12 Chemistry Question Paper 2014 Set 1 - Delhi
CBSE Class 12 Chemistry Question Paper 2014 Set 1 - Foreign
CBSE Class 12 Chemistry Question Paper 2014 Set 1 - Outside Delhi
CBSE Class 12 Chemistry Question Paper 2014 Set 2 - Delhi
CBSE Class 12 Chemistry Question Paper 2014 Set 2 - Foreign
CBSE Class 12 Chemistry Question Paper 2014 Set 2 - Outside Delhi
CBSE Class 12 Chemistry Question Paper 2014 Set 3 - Delhi
CBSE Class 12 Chemistry Question Paper 2014 Set 3 - Foreign
CBSE Class 12 Chemistry Question Paper 2014 Set 3 - Outside Delhi
CBSE Class 12 Chemistry Question Paper SA2 2014 (1)
CBSE Class 12 Chemistry Question Paper SA2 2014 (2)
CBSE Class 12 Chemistry Question Paper SA2 2014 (3)
CBSE Class 12 Chemistry Question Paper SA2 2014 (4)
2013
CBSE Class 12 Chemistry Question paper 2013 (1)
CBSE Class 12 Chemistry Question paper 2013 (2)
CBSE Class 12 Chemistry Question paper 2013 (3)
CBSE Class 12 Chemistry Question paper 2013 (4)
CBSE Class 12 Chemistry Question paper 2013 (5)
CBSE Class 12 Chemistry Question paper 2013 (6)
CBSE Class 12 Chemistry Question Paper SA 2 2013 (1)
CBSE Class 12 Chemistry Question Paper SA 2 2013 (2)
CBSE Class 12 Chemistry Question Paper SA1 2013 (1)
CBSE Class 12 Chemistry Question Paper SA1 2013 (2)
CBSE Class 12 Chemistry Question Paper SA2 2013
2012
CBSE Class 12 Chemistry Question paper 2012 (1)
CBSE Class 12 Chemistry Question paper 2012 (2)
CBSE Class 12 Chemistry Question Paper SA 1 2012 (1)
CBSE Class 12 Chemistry Question Paper SA 1 2012 (2)
2011
CBSE Class 12 Chemistry 2011 Solved Question Paper
CBSE Class 12 Chemistry Question paper 2011 (1)
CBSE Class 12 Chemistry Question paper 2011 (2)
CBSE Class 12 Chemistry Question paper 2011 (3)
2010
CBSE Class 12 Chemistry 2010 Solved Question Paper
CBSE Class 12 Chemistry Question Paper SA 1 2010 (1)
2009
CBSE Class 12 Chemistry Question paper 2009 (1)
CBSE Class 12 Chemistry Question paper 2009 (2)
CBSE Class XII Chemistry Question paper 2009
2008
CBSE Class 12 Chemistry Question Paper 2008
CBSE Class 12 Chemistry Question paper 2008 (1)
CBSE Class 12 Chemistry Question paper 2008 (2)
CBSE Class 12 Chemistry Question paper 2008 (3)
CBSE Class 12 Chemistry Question Paper 2008 Answers
CBSE Class 12 Chemistry Question Paper 2008 Answers(2)
CBSE Class 12 Chemistry Question Paper 2008(2)
CBSE Class XII Chemistry Question paper 2008
2007
CBSE Class 12 Chemistry Question paper 2007 (1)
CBSE Class 12 Chemistry Question paper 2007 (2)
CBSE Class 12 Chemistry Question paper 2007 (3)
2006
CBSE Class 12 Chemistry Question paper 2006 (1)
CBSE Class 12 Chemistry Question paper 2006 (2)
CBSE Class 12 Chemistry Question paper 2006 (3)
CBSE Class 12 Chemistry Question paper 2006 (4)
2005
CBSE Class 12 Chemistry Question paper 2005 (1)
CBSE Class 12 Chemistry Question paper 2005 (2)
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CBSE Class 12 Chemistry Question Paper 2021 Set B Solved

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Regularly practicing CBSE Class 12 Chemistry Question Paper 2021 Set B 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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