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.
What to expect: This mock test covers key concepts from the Mole Concept and Stoichiometry chapter — including application-based and competency-focused questions aligned with how ICSE actually sets the paper.
Tip: Attempt without notes first to identify gaps, then review explanations for any wrong answers. Retake after a few days for best retention.
Sample questions
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1.Assertion: Vapour density is used to determine molecular weight. Reason: Molecular weight is twice the vapour density. (a) Both assertion and reason are true and reason is the correct explanation of assertion. (b) Both assertion and reason are true, but reason is not the correct explanation of assertion. (c) Assertion is true, but reason is false. (d) Assertion is false, but reason is true.
- A.Both assertion and reason are true and reason is the correct explanation of assertion.
- B.Both assertion and reason are true, but reason is not the correct explanation of assertion.
- C.Assertion is true, but reason is false.
- D.Assertion is false, but reason is true.
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2.An acid of Phosphorus has the following percentage composition: 2.47% of Hydrogen, 38.27% of Phosphorus, and 59.26% of Oxygen. Given that its relative molecular mass is 162, which of the following represents the empirical formula and the molecular formula of this acid?
- A.Empirical formula = HPO₃, Molecular formula = H₂P₂O₆
- B.Empirical formula = H₂PO₃, Molecular formula = H₄P₂O₆
- C.Empirical formula = H₃PO₄, Molecular formula = H₆P₂O₈
- D.Empirical formula = HPO₂, Molecular formula = H₂P₂O₄
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3.(ii) Calculate the number of moles of oxygen present in the above volume and also the number of molecules.
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4.The gases hydrogen, oxygen, carbon dioxide, sulphur dioxide, and chlorine are arranged in order of their increasing relative molecular masses. Given 8 g of each gas at STP, which gas will contain the least number of molecules and which gas the most?
- A.Least: H₂; Most: Cl₂
- B.Least: Cl₂; Most: H₂
- C.Least: O₂; Most: CO₂
- D.Least: SO₂; Most: H₂
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5.Find the molecular formula of a hydrocarbon having vapour density 15, which contains 20% of Hydrogen.
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