CBSE 2015 Chemistry Question Paper for Class 12

About this paper

This is the CBSE Class 12 Chemistry (Theory) question paper code 56/1/P, Series SSO, Set 1, from the 2015 board examination, printed in both Hindi and English. It carries 70 marks over three hours and has 26 compulsory questions: five one-mark questions, five two-mark questions, twelve three-mark questions, one four-mark value-based question and three five-mark long answers. The value-based question describes a school principal who bans junk food to tackle diabetes and depression among children. Internal choices appear in one two-mark question, one three-mark question and all three long answers. Log tables may be used, but calculators are not allowed. This copy has the questions only, without answers.

Exam

CBSE Class 12

Subject

Chemistry

Year

2015

Paper code

56/1/P

Maximum marks

70

Time allowed

3 hours + 15 min reading

Questions

26

Pages

16

Answers included

No, questions only

Paper pattern

• Questions 1–5

  5 marks

  Very short answer questions, one mark each

• Questions 6–10

  10 marks

  Short answer questions, two marks each; internal choice in one

• Questions 11–22

  36 marks

  Short answer questions, three marks each; internal choice in one

• Question 23

  4 marks

  Value-based question

• Questions 24–26

  15 marks

  Long answer questions, five marks each, each with an internal choice

Topics covered

• Solid state
• Solutions and colligative properties
• Electrochemistry
• Chemical kinetics
• Surface chemistry
• Isolation of elements
• p-Block elements
• d- and f-Block elements
• Coordination compounds
• Haloalkanes, alcohols, phenols and ethers
• Aldehydes, ketones and amines
• Biomolecules, polymers and chemistry in everyday life

Questions from this paper

1. How much charge is required for the reduction of 1 mol of Zn²⁺ to Zn?
2. Calculate the freezing point of the solution when 31 g of ethylene glycol (C₂H₆O₂) is dissolved in 500 g of water. (Kf for water = 1.86 K kg mol⁻¹)
3. The rate constant of a first order reaction increases from 2 × 10⁻² to 4 × 10⁻² when the temperature changes from 300 K to 310 K. Calculate the energy of activation (Ea).
4. What is the principle behind the zone refining of metals?
5. Calculate the e.m.f. and ΔG for the cell Mg(s) | Mg²⁺ (0.001 M) || Cu²⁺ (0.0001 M) | Cu(s), given E°(Mg²⁺/Mg) = −2.37 V and E°(Cu²⁺/Cu) = +0.34 V.
6. Why do actinoids show a wide range of oxidation states? Write one similarity between the chemistry of lanthanoids and actinoids.