CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set B

Access and download CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set B, 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 B to begin your self-assessment today.

Chemistry Class 12 Question Paper PDF with Solutions

SECTION A
 CHEMISTRY
Read the given passage and answer the questions number 1 to 5 that follow :
 
Organic compounds containing amine as functional group are present in a vivid variety of compounds, namely amino acids, hormones, neurotransmitters, DNA, alkaloids, dyes, etc. Drugs including nicotine, morphine, codeine and heroin, etc. which have physiological effects on humans also contain amino group in one form or another. Amines are basic because of the presence of lone pair of electrons on nitrogen.
 
Addition of nitrogen into an organic framework leads to the formation of two families of molecules, namely amines and amides. As chemistry students, we must appreciate the versatility of nitrogen.
 
1. What are amino acids ?
 
2. Why are amino acids amphoteric ?
 
3. Give one point of difference between acidic and basic amino acid.
 
4. What are essential amino acids ?
 
5. Name the linkage formed when carboxyl end of one amino acid condenses with amino end of other amino acid.
 
6. Name the process used for the benefaction of ores if the ore is soluble in some suitable solvent.
 
7. Give an example of a metal which can be purified by the process of distillation.
 
8. What type of isomerism is shown by the complex [Co(NH3)5 NO2] Cl2 ?
 
9. An organic compound is adsorbed on the surface of silica gel. Name the process of removing the organic compound from silica gel.
 
10. Calculate the overall order of the reaction whose rate law expression was predicted as :
Rate = k[NO]3/2 [O2]1/2
 
Questions number 11 to 15 are multiple choice questions :
 
11. 50 mL of an aqueous solution of glucose C6H12O6 (Molar mass : 180 g/mol) contains 6·02 x 1022 molecules. The concentration of the solution will be
 
(A) 0·1 M
 
(B) 0·2 M
 
(C) 1·0 M
 
(D) 2·0 M
 
12. If the standard electrode potential of an electrode is greater than zero, then we can infer that its
 
(A) reduced form is more stable compared to hydrogen gas.
 
(B) oxidised form is more stable compared to hydrogen gas.
 
(C) reduced and oxidised forms are equally stable.
 
(D) reduced form is less stable than the hydrogen gas.
 
13. Total number of unpaired electrons present in Co3+ (Atomic number = 27) is
 
(A) 2
 
(B) 7
 
(C) 3
 
(D) 5
Please click on below link to download CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set B.

CBSE Class 12 Chemistry Boards 2020 Question Paper Solved Set B

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 B 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 B 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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