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.

AcademicChemistryNCERTClass 10

Calcium carbonate gives carbon dioxide gas when reacts with hydrochloric acid. X is Calcium carbonate.
When calcium carbonate reacts with HCl, it gives out CO2 gas.
$CaCO_3 + HCl→ CaCl_2+CO_2+H_2O$

When CO2 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.

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).
Updated on 10-Oct-2022 13:27:21