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# A metal **carbonate X** on reacting with 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 the anode during electrolysis of brine is passed on dry Y, and it gives a compound Z, used for disinfecting drinking water. Identity X, Y, G and Z.

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

**X is Calcium carbonate.**When calcium carbonate reacts with HCl, it gives out CO

_{2}gas.$CaCO_3 + HCl→ CaCl_2+CO_2+H_2O$

When CO

_{2}is passed through lime water, it turns milky due to the formation of Calcium carbonate.Hence, solution

**Y is lime water.**On the electrolysis of brine,

**chlorine gas**is deposited over anode which gives calcium oxychloride (Bleaching powder) on passing over slaked lime.**Bleaching powder**is used for disinfecting drinking water.

Therefore,

**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).**

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