ICSE Class 10 Mole Concept and Stoichiometry — Mock Test (2027)

Free online mock test for Mole Concept and Stoichiometry (ICSE Class 10 Chemistry) — 20 competency-based questions based on the latest CISCE 2027 syllabus, with instant marking. Try the samples below, then take the full test free.

Sample questions

1. 1.Given the reaction: Mg + H₂SO₄ → MgSO₄ + H₂ + SO₂ (when hot and concentrated). (i) Calculate the mass of pure H₂SO₄ acid needed for the reaction with 60 g of magnesium. Molar mass of Mg = 24 g/mol Molar mass of H₂SO₄ = 98 g/mol (ii) Calculate the volume of SO₂ gas liberated at S.T.P. when 60 g of magnesium reacts with hot concentrated sulphuric acid.
2. 2.A compound of Sodium, Sulphur, and Oxygen has the following percentage composition: Na = 29.11%, S = 40.51%, O = 30.38%. What is its empirical formula? [Atomic masses: O = 16, Na = 23, S = 32]
   • A.NaSO₃
   • B.Na₂S₂O₃
   • C.Na₂SO₄
   • D.NaS₂O₂
3. 3.A certain hydrocarbon has the following percentage composition: C = 83.72%, H = 16.27%. The vapour density of the compound was found to be 43. The molecular formula of the compound is
   • A.C₆H₈
   • B.C₆H₂
   • C.C₆H₁₄
   • D.C₆H₁₂
4. 4.Calculate the percentage of Nitrogen in Aluminium nitride (N = 14, Al = 27).
   • A.24.146%
   • B.34.146%
   • C.48.276%
   • D.51.852%
5. 5.Given that the relative molecular mass of copper oxide is 80, what volume of ammonia (measured at S.T.P.) is required to completely reduce 120 g of copper oxide? The equation for the reaction is 3CuO + 2NH₃ → 3Cu + N₂ + 3H₂O (Volume occupied by 1 mole of a gas at S.T.P. is 22.4 litres)
   • A.22.4 dm³ of NH₃
   • B.44.8 dm³ of NH₃
   • C.11.2 dm³ of NH₃
   • D.67.2 dm³ of NH₃