ISC 2019 Chemistry Question Paper for Class 12

About this paper

This is ISC Class 12 Chemistry Paper 1 (Theory), code 862A, from the 2019 board examination. It carries 70 marks over three hours, with fifteen minutes extra for reading, and all 18 questions are compulsory. Question 1 is a 20-mark mix of fill-in-the-blank items, multiple choice, matching and short problems. Seven questions carry two marks, seven carry three marks and three carry five marks, with an internal choice in two of the two-mark questions, two of the three-mark questions and each five-mark question. The calculations cover colligative properties, a body-centred cubic cell and electrolysis, and other questions take in drugs, nylon and PTFE, vitamins, coordination compounds and the extraction of aluminium, silver and iron. Constants are printed on the paper. This copy has the questions only.

Exam

ISC Class 12

Subject

Chemistry

Year

2019

Paper code

862A

Maximum marks

70

Time allowed

3 hours + 15 min reading

Questions

18

Pages

8

Answers included

No, questions only

Paper pattern

• Question 1

  20 marks

  Four compulsory parts: fill in the blanks, multiple choice, matching and short answers

• Questions 2–8

  14 marks

  Two marks each; internal choice in two questions

• Questions 9–15

  21 marks

  Three marks each; internal choice in two questions

• Questions 16–18

  15 marks

  Five marks each, each with an internal choice

Topics covered

• Chemical kinetics
• Solutions and colligative properties
• Electrochemistry
• Solid state
• Surface chemistry
• Coordination compounds
• d- and f-block elements
• p-block elements
• Metallurgy
• Amines and diazonium salts
• Biomolecules
• Polymers

Questions from this paper

1. When 0.4 g of acetic acid is dissolved in 40 g of benzene, the freezing point of the solution is lowered by 0.45 K. Calculate the degree of association of acetic acid, which forms a dimer in benzene. (Kf for benzene = 5.12 K kg mol−1.)
2. An element has a body-centred cubic structure. Its density is 8.0 g/cm³ and the cell edge is 250 pm. Calculate the atomic mass of the element. (NA = 6.023 × 10²³.)
3. Calculate the mass of silver deposited at the cathode when a current of 2 amperes is passed through AgNO3 solution for 15 minutes. (Atomic weight of Ag = 108, 1 F = 96,500 C.)
4. What are tranquilizers? Give one example.
5. Name the monomers of nylon 6,6, and name the monomer and the type of polymerisation used to make PTFE.
6. Define peptisation, electrophoresis and dialysis, with a suitable example of each.