ISC 2017 Chemistry Question Paper for Class 12

About this paper

This is ISC Class 12 Chemistry Paper 1 (Theory), code 862A, from the 2017 board examination. It carries 70 marks and allows three hours, plus fifteen minutes to read the paper. Part I is a compulsory 20-mark question of fill-in-the-blank items, multiple-choice questions, short answers and a matching exercise. From Part II, worth 50 marks, the candidate answers two questions from Section A, two from Section B and two from Section C. Section A is physical chemistry, Section B covers coordination compounds, the p-block and extraction of silver, and Section C is organic chemistry, including name reactions and vitamins. Values of R, the faraday and Avogadro's number are printed for the calculations. This copy has the questions only.

Exam

ISC Class 12

Subject

Chemistry

Year

2017

Paper code

862A

Maximum marks

70

Time allowed

3 hours + 15 min reading

Questions

10

Pages

7

Answers included

No, questions only

Paper pattern

• Part I

  20 marks

  Question 1, compulsory: fill in the blanks, multiple choice, short answers and a matching exercise

• Section A

  20 marks

  Questions 2–4 on physical chemistry, 10 marks each; answer any two

• Section B

  10 marks

  Questions 5–7 on inorganic chemistry, 5 marks each; answer any two

• Section C

  20 marks

  Questions 8–10 on organic chemistry, 10 marks each; answer any two

Topics covered

• Solutions and colligative properties
• Chemical kinetics
• Electrochemistry
• Ionic equilibrium
• Solid state
• Coordination compounds
• p-block elements
• Metallurgy of silver
• Organic name reactions
• Amines
• Biomolecules
• Polymers

Questions from this paper

1. Determine the freezing point of a solution containing 0.625 g of glucose (C6H12O6) dissolved in 102.8 g of water. (Freezing point of water = 273 K, Kf for water = 1.87 K kg mol−1.)
2. A 0.15 M aqueous solution of KCl exerts an osmotic pressure of 6.8 atm at 310 K. Calculate the degree of dissociation of KCl. (R = 0.0821 L atm K−1 mol−1.)
3. Lead sulphide has a face-centred cubic structure. If the edge length of the unit cell is 495 pm, calculate the density of the crystal. (Atomic weights: Pb = 207, S = 32.)
4. Why is the freezing-point depression of 0.4 M NaCl nearly twice that of 0.4 M glucose?
5. Write the formulae of potassium trioxalatoaluminate(III) and hexaaquairon(II) sulphate.
6. How will you distinguish between primary, secondary and tertiary amines by Hinsberg's test?