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A metal carbonate X on treatment with a mineral acid liberates a gas whichwhen passed through aqueous solution of a substance Y gives back X. Thesubstance Y on reaction with the gas obtained at anode during electrolysis ofbrine gives a compound Z, which can decolourise coloured fabrics. Thecompounds X, Y and Z respectively are(a) CaCO3, Ca(OH)2, CaOC12(b) Ca(OH)2, CaO, CaOC12(c) CaCO3, CaOC12, Ca(OH)2(d) Ca(OH)2, CaCO3, CaOC12

Question

A metal carbonate X on treatment with a mineral acid liberates a gas whichwhen passed through aqueous solution of a substance Y gives back X. Thesubstance Y on reaction with the gas obtained at anode during electrolysis ofbrine gives a compound Z, which can decolourise coloured fabrics. Thecompounds X, Y and Z respectively are(a) CaCO3, Ca(OH)2, CaOC12(b) Ca(OH)2, CaO, CaOC12(c) CaCO3, CaOC12, Ca(OH)2(d) Ca(OH)2, CaCO3, CaOC12

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Solution

The answer is (a) CaCO3, Ca(OH)2, CaOC12.

Here's the step by step explanation:

  1. The metal carbonate X is CaCO3 (Calcium Carbonate). When it reacts with a mineral acid, it liberates a gas which is CO2 (Carbon Dioxide).

  2. The substance Y is Ca(OH)2 (Calcium Hydroxide). When CO2 is passed through an aqueous solution of Ca(OH)2, it gives back CaCO3.

  3. The gas obtained at anode during electrolysis of brine is Cl2 (Chlorine). When Cl2 reacts with Ca(OH)2, it gives a compound Z which is CaOCl2 (Calcium Oxychloride). This compound is also known as bleaching powder and it can decolourise coloured fabrics.

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