Question

A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identity X, Y, G and Z

Answer 1

X is Calcium carbonate (CaCO3).

CaCO3 + Acid = Metal Salt + Water + CO2

If we take the acid as HCl then the reaction would be:

CaCO3 + 2HCl -------> CaCl2 + CO2 + H2O

Y is Lime water Ca(OH)2 or slaked lime.When this CO2 gas is passed through Lime water , the lime water turns milky due to the formation of Calcium Carbonate and thus it is formed again.

Ca(OH)2 + CO2 ---------> CaCO3 + H2O

The gas evolved at anode during electrolysis of brine is chlorine (G) When chlorine gas is passed through dry Ca(OH)2 (Y) produces bleaching powder (Z) used for disinfecting drinking water.

2Ca(OH)2 + 2Cl2 ------> Ca(OCl)2      +    CaCl2 + 2H2O

                                      Bleeching powder (Z)

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Answer 2

Explanation:

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Acid Base and Salt

NCERT Exemplar Solution Long Answer 2

A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back.

On the other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identity X, Y, G and Z.

Answer: Calcium carbonate gives carbon dioxide gas when reacts with hydrochloric acid.

CaCO3 + 2HCl ⇨ CaCl2 + CO2 + H2O

Carbon dioxide turns lime water milky when passed through it because of formation of calcium carbonate. When carbon dioxide; so formed; is passed through lime water, lime water turns milky because of the formation of calcium carbonate.

CO2 + Ca(OH)2 ⇨ CaCO3 + H2O

On the electrolysis of brine, chlorine gas is deposited over anode which gives calcium oxychloride (Bleaching powder) on passing over slaked lime. The bleaching powder is used in disinfecting the drinking water.

Ca(OH)2 + Cl2 ⇨ CaOCl2 + H2O

Bleaching powder is used for disinfecting drinking water.

Therefore;

Metal carbonate ‘X’ is calcium carbonate.

Solution ‘Y’ is lime water (Calcium hydroxide).

Gas ‘G’ is chlorine gas.

Dry ‘Y’ is dry calcium hydroxide (dry slaked lime).

Compound ‘Z’ is bleaching powder (Calcium oxychloride).