Zinc granules on treating with an acid X, form zinc sulphate (ZnSO₄) salt along with the evolution of a gas Y, which burns with a pop sound when brought near to a burning candle. Identify acid X and gas evolved Y:
The correct option is [C]. When zinc granules react with sulphuric acid (X), zinc sulphate (ZnSO₄) forms and hydrogen gas (Y) is released. The hydrogen gas burns with a pop sound near a candle, confirming its identity.
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ANSWER: [C]
Explanation: When an acid reacts with a metal, hydrogen gas is liberated. In the given reaction, when dilute sulphuric acid reacts with zinc granules, hydrogen gas is liberated and zinc sulphate solution is formed:
Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂ (g)
The presence of hydrogen gas is tested by bringing a lighted candle near it. When a lighted candle is brought near the test tube containing hydrogen gas, it burns with a “pop sound” making a little explosion. Hence, acid “X” is sulphuric acid and gas “Y” is hydrogen gas.