CBSE Class 12 Chemistry Question Paper 2020 with Solution

About this paper

This is the CBSE Class 12 Chemistry (Theory) question paper code 56/2/1, Series HMJ/2, Set 1, from the 2020 board examination. It carries 70 marks over three hours and has 37 compulsory questions in four sections. Section A has twenty one-mark items: a passage on amines and amino acids with five questions, five one-word answers, five multiple-choice questions and five assertion–reason questions. Sections B, C and D have two-, three- and five-mark questions; one five-mark question asks you to identify a chain of compounds that starts from crown-shaped sulphur and leads to sulphuric acid. Internal choices are given in two two-mark, two three-mark and all three five-mark questions. Calculators and log tables are not permitted. This copy has the questions only, without solutions.

Exam

CBSE Class 12

Subject

Chemistry

Year

2020

Paper code

56/2/1

Maximum marks

70

Time allowed

3 hours + 15 min reading

Questions

37

Pages

10

Answers included

No, questions only

Paper pattern

• Section A

  20 marks

  Questions 1–20, one mark each: a five-question passage on amino acids, five one-word answers, five multiple-choice and five assertion–reason questions

• Section B

  14 marks

  Questions 21–27, short answers of two marks each; internal choice in two

• Section C

  21 marks

  Questions 28–34, long answer type I of three marks each; internal choice in two

• Section D

  15 marks

  Questions 35–37, long answer type II of five marks each, each with an internal choice

Topics covered

• Solutions and colligative properties
• Electrochemistry and conductance
• Chemical kinetics
• Surface chemistry and catalysis
• Isolation of elements
• p-Block elements
• d-Block elements and interstitial compounds
• Coordination compounds
• Haloalkanes, alcohols and phenols
• Aldehydes, ketones and amines
• Biomolecules and polymers
• Chemistry in everyday life

Questions from this paper

1. Name the process used for the beneficiation of ores if the ore is soluble in some suitable solvent.
2. Define adsorption isotherm. Give the empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature.
3. A reaction is first order with respect to reactant A as well as reactant B. Give the rate law. Also give one point of difference between average rate and instantaneous rate.
4. Give the chemical reactions involved in the leaching of alumina from bauxite.
5. An antifreeze solution is prepared by dissolving 31 g of ethylene glycol (molar mass = 62 g mol⁻¹) in 600 g of water. Calculate the freezing point of the solution. (Kf for water = 1.86 K kg mol⁻¹)
6. O and Cl have nearly the same electronegativity, yet oxygen forms hydrogen bonds while chlorine does not. Give a reason.