ICSE 2018 Chemistry Solved Paper for Class 10

About this paper

This is the ICSE Class 10 Chemistry (Science Paper 2) question paper from the 2018 examination, retyped with the site's answers after each question. It carries 80 marks, with two hours of writing time plus 15 minutes of reading time. Section I (40 marks) is compulsory: Question 1 has eight five-mark parts on multiple choice, one-word answers, equations, IUPAC names, observations, reasons, naming gases and fill in the blanks. In Section II (40 marks) candidates attempt any four of Questions 2–7, covering Period 3 trends, the preparation of ammonia and hydrogen chloride, electro-refining of copper, mole calculations, homologous series, aluminium extraction, esterification and salt preparation. Some of the printed answers contain mistakes, so check them against your textbook.

Exam

ICSE Class 10

Subject

Chemistry

Year

2018

Maximum marks

80

Time allowed

2 hours + 15 min reading

Questions

7

Pages

10

Answers included

Yes

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 of aluminium
• Hydrogen chloride
• Ammonia
• Nitric acid
• Sulphuric acid
• Organic chemistry

Questions from this paper

1. Give a reason why the conductivity of dilute hydrochloric acid is greater than that of acetic acid.
2. State why concentrated sulphuric acid is not used for drying ammonia gas, and why ammonia gas is not collected over water.
3. The percentage composition of a gas is nitrogen 82.35% and hydrogen 17.64%. Find the empirical formula of the gas. [N = 14, H = 1]
4. Aluminium carbide reacts with water according to the equation Al₄C₃ + 12H₂O → 4Al(OH)₃ + 3CH₄. What volume of methane at s.t.p. is obtained from 12 g of aluminium carbide?
5. Ethane burns in oxygen according to the equation 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O. If 1250 cc of oxygen is burnt with 300 cc of ethane, calculate the volume of CO₂ formed and the volume of unused O₂.
6. Give a chemical test to distinguish between lead nitrate solution and zinc nitrate solution.