ISC 2016 Chemistry Question Paper for Class 12

About this paper

This is ISC Class 12 Chemistry Paper 1 (Theory) from the 2016 CISCE board examination, paper code 862A (printed as 1216-862 A). It carries 70 marks and runs for three hours, with fifteen minutes extra for reading. Part I, of 20 marks, is compulsory. From Part II, of 50 marks, candidates answer six questions: two from Section A, two from Section B and two from Section C. The sections cover physical, inorganic and organic chemistry in that order. Values of R, the Faraday and Avogadro's number are printed for the numericals, and balanced equations are required wherever possible. This copy has the questions only.

Exam

ISC Class 12

Subject

Chemistry

Year

2016

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 is compulsory: five fill-in-the-blanks, five multiple-choice items, five short answers and a five-point match

• Section A

  20 marks

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

• Section B

  10 marks

  Questions 5–7 on coordination compounds, the p-block and lanthanides, 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 and conductance
• Ionic equilibrium
• Solid state
• Coordination compounds
• p-block elements
• Potassium permanganate
• Lanthanide contraction
• Organic name reactions
• Carbonyl compounds and ethers
• Carbohydrates, polymers and amines

Questions from this paper

1. A 10% aqueous solution of cane sugar (molecular weight 342) is isotonic with a 1.754% aqueous solution of urea. Find the molecular mass of urea.
2. What is the boiling point of a solution of 48 g of a solute of molecular weight 58 g mol⁻¹ in 1200 g of water? (Kb for water = 0.513°C kg mol⁻¹; boiling point of water = 100°C.)
3. In a first-order reaction, 10% of the reactant is consumed in 25 minutes. Calculate the half-life and the time needed for 87.5% of the reaction.
4. For the cell reaction 2Ag⁺ + Cd → 2Ag + Cd²⁺ at 298 K, E°(Ag⁺/Ag) = 0.80 V and E°(Cd²⁺/Cd) = −0.40 V. Find the emf when [Cd²⁺] = 0.1 M and [Ag⁺] = 0.2 M.
5. What is meant by lanthanide contraction? Write the general electronic configuration of the inner transition elements.
6. An organic compound A of formula C₇H₆O, treated with NaOH and then acid, gives B and C. Oxidation of B gives A again. Identify A, B, C, D and E, and name the reaction of A with NaOH.