ICSE 2020 Chemistry Question Paper for Class 10

About this paper

This is the official ICSE Class 10 Chemistry (Science Paper 2) question paper from the 2020 examination, paper code T20 522. Writing time is two hours, plus 15 minutes of reading time. Section I (40 marks) is compulsory: Question 1 has eight five-mark parts on multiple choice, observations, equations, structural formulae and IUPAC names, reasons, gas-volume and mole calculations, one-word answers and fill in the blanks. In Section II (40 marks) candidates attempt any four of Questions 2–7, which include electron dot diagrams, Baeyer's process, matching gases with their tests, isomers of pentane, the laboratory preparation of hydrogen chloride, percentage composition of cryolite, identifying salts from observations and a diagram of nickel sulphate electrolysis with nickel electrodes. The paper has questions only, without answers.

Exam

ICSE Class 10

Subject

Chemistry

Year

2020

Paper code

T20 522

Maximum marks

80

Time allowed

2 hours + 15 min reading

Questions

7

Pages

9

Answers included

No, questions only

Paper pattern

• Section I

  40 marks

  Question 1, compulsory, with eight five-mark parts (a)–(h)

• Section II

  40 marks

  Questions 2–7, attempt any four; 10 marks each

Topics covered

• Periodic table and periodic properties
• Chemical bonding
• Acids, bases and salts
• Analytical chemistry
• Mole concept and stoichiometry
• Electrolysis
• Metallurgy and alloys
• Hydrogen chloride
• Ammonia
• Nitric acid
• Sulphuric acid
• Organic chemistry

Questions from this paper

1. State one relevant reason why soda lime is preferred to sodium hydroxide in the laboratory preparation of methane.
2. Calculate the volume occupied by 80 g of carbon dioxide at STP. [C = 12, O = 16]
3. Give balanced chemical equations for the reactions in Baeyer's process by which bauxite is converted to alumina.
4. Calculate the percentage of fluorine, sodium and aluminium in sodium aluminium fluoride, Na₃AlF₆, to the nearest whole number. [Na = 23, Al = 27, F = 19]
5. Distinguish between ammonium sulphate crystals and sodium sulphate crystals using a chemical test.
6. An aqueous solution of nickel(II) sulphate is electrolysed using nickel electrodes. What do you observe at the cathode and the anode?