ICSE Class 10 Chemistry Question Paper 2025 with Solutions

About this paper

This is the ICSE Class 10 Chemistry (Science Paper 2) question paper from the 2025 examination, paper code T25 522. It carries 80 marks, with two hours of writing time plus 15 minutes of reading time. Section A (40 marks) is compulsory: Question 1 has 15 one-mark multiple-choice questions, including two assertion–reason items, and Question 2 opens with a diagram of a student preparing ammonia from aluminium nitride, then terms, sentence completion, matching catalysts and organic names. In Section B candidates attempt any four of Questions 3–8, worth 10 marks each, with situation-based items such as Rohit's silver and lead chloride test tubes and Seema's copper turnings in acid P. This scan is a used copy with options ticked in pen; there are no worked answers.

Exam

ICSE Class 10

Subject

Chemistry

Year

2025

Paper code

T25 522

Maximum marks

80

Time allowed

2 hours + 15 min reading

Questions

8

Pages

16

Paper pattern

• Section A – Question 1

  15 marks

  15 multiple-choice questions, one mark each, including two assertion–reason items

• Section A – Question 2

  25 marks

  Five five-mark parts: an ammonia-preparation diagram, terms, sentence completion, matching catalysts, and organic structures and names

• Section B

  40 marks

  Questions 3–8, 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
• Ammonia
• Nitric acid
• Sulphuric acid and the Contact Process
• Organic chemistry

Questions from this paper

1. State the term for undistilled alcohol containing a large amount of methanol.
2. Justify the statement: graphite electrodes are preferred in the electrolysis of molten lead bromide.
3. If 60 g of magnesium reacts with concentrated sulphuric acid according to Mg + 2H₂SO₄ → MgSO₄ + 2H₂O + SO₂, calculate the mass of sulphuric acid needed and the volume of sulphur dioxide liberated at S.T.P. [Mg = 24, H = 1, S = 32, O = 16]
4. A gas cylinder can hold 150 g of hydrogen under certain conditions of temperature and pressure. If an identical cylinder can hold 450 g of gas G under the same conditions, find the vapour density and the molecular weight of G.
5. Acidulated water is electrolysed using platinum electrodes. Why is dilute sulphuric acid added to the water, and what is observed at the anode?
6. State Avogadro's law.