ICSE Class 10 Some Basic Concepts of Chemistry — Mock Test (2027)
Free online mock test for Some Basic Concepts of Chemistry (ICSE Class 10 Chemistry) — 104 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 Some Basic Concepts of Chemistry 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.How many grams of HCl react with 5.0 g of MnO2 according to 4HCl(aq) + MnO2(s) -> 2H2O(l) + MnCl2(aq) + Cl2(g)? (Molar masses: MnO2 = 87, HCl = 36.5)
- A.8.4 g
- B.2.1 g
- C.16.8 g
- D.4.2 g
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2.Two pure samples of the same compound (one natural, one synthetic) are analysed. What must be true of their percentage composition, and which law does this confirm?
- A.Identical composition, confirming the Law of Definite Proportions
- B.Different composition, confirming the Law of Multiple Proportions
- C.Identical composition, confirming Avogadro's Law
- D.Different composition, confirming the Law of Conservation of Mass
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3.How many molecules are present in 9 g of water (H2O, molar mass = 18 g/mol)? (Avogadro number = 6.022 x 10^23 per mol)
- A.6.022 x 10^23 molecules
- B.3.011 x 10^23 molecules
- C.1.2044 x 10^24 molecules
- D.9 x 10^23 molecules
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4.Calculate the mass per cent of hydrogen in water (H2O, molar mass = 18 g/mol; H = 1, O = 16).
- A.88.79%
- B.5.56%
- C.11.18%
- D.50%
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5.The number of molecules in 1 mole of water is approximately:
- A.6.022 x 10^23
- B.18 x 10^23
- C.6.022 x 10^46
- D.1.008 x 10^23
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