ICSE 2019 Chemistry Question Paper for Class 10

About this paper

This is the official ICSE Class 10 Chemistry (Science Paper 2) question paper from the 2019 examination, paper code T19 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, fill in the blanks, equations, observations, mole calculations, IUPAC names, definitions and arranging elements and ions in order. In Section II (40 marks) candidates attempt any four of Questions 2–7, which include electron dot structures, a pH table, an extract of the periodic table, distinguishing tests, methods of salt preparation, the Hall–Héroult process, uses of alloys, empirical formula problems and the industrial manufacture of ammonia and sulphuric acid. The paper has questions only, without answers.

Exam

ICSE Class 10

Subject

Chemistry

Year

2019

Paper code

T19 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
• Ammonia
• Nitric acid
• Sulphuric acid
• Organic chemistry

Questions from this paper

1. Calculate the number of moles in 12 g of oxygen gas. [O = 16]
2. State one observation when ammonia gas is passed over heated copper(II) oxide.
3. Distinguish between ferrous sulphate solution and ferric sulphate solution using sodium hydroxide solution.
4. In the Hall–Héroult process, what is the function of cryolite used along with alumina as the electrolyte?
5. What mass of copper hydroxide is precipitated by using 200 g of sodium hydroxide in the reaction 2NaOH + CuSO₄ → Na₂SO₄ + Cu(OH)₂? [H = 1, O = 16, Na = 23, S = 32, Cu = 64]
6. Find the empirical formula and the molecular formula of an organic compound containing C = 75.92%, H = 6.32% and N = 17.76%, whose vapour density is 39.5.