ICSE Class 10 Hydrogen Chloride (HCl) — Mock Test (2027)
Free online mock test for Hydrogen Chloride (HCl) (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 Hydrogen Chloride (HCl) 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.Which two aqueous solutions give a white precipitate when reacted with dilute hydrochloric acid?
- A.Lead nitrate solution and Silver nitrate solution
- B.Copper sulphate solution and Zinc sulphate solution
- C.Sodium chloride solution and Potassium chloride solution
- D.Barium chloride solution and Calcium chloride solution
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2.Complete and balance the following chemical equation: H₂ + Cl₂ → ______
- A.HCl
- B.2HCl
- C.H₂Cl₂
- D.HCl₂
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3.(iv) Hydrogen chloride gas is not collected over ______________ as it is ______________ soluble in water.
- A.water, highly
- B.air, slightly
- C.mercury, moderately
- D.oil, sparingly
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4.Why does dry hydrogen chloride gas not affect a dry strip of blue litmus paper but turns it red in the presence of a drop of water?
- A.Dry HCl is covalent and lacks H⁺ ions, but ionizes in water to release H⁺ ions that turn litmus red.
- B.Dry HCl is already acidic but requires heat to react with litmus; water provides the necessary energy.
- C.Dry HCl gas is neutral and only reacts with litmus when dissolved in any liquid, not just water.
- D.The litmus paper must be moist to absorb HCl gas; dry HCl cannot penetrate dry litmus.
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5.Why is hydrogen chloride gas dried using concentrated sulphuric acid and not phosphorus pentoxide or calcium oxide?
- A.Concentrated sulphuric acid reacts with HCl to form a stable compound, making it effective for drying.
- B.Phosphorus pentoxide and calcium oxide do not react with HCl, so they cannot dry the gas.
- C.Concentrated sulphuric acid does not react with HCl, while phosphorus pentoxide and calcium oxide chemically react with it.
- D.Phosphorus pentoxide and calcium oxide absorb HCl physically but are less efficient than sulphuric acid.
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