a metal carbonatr X an reacting with an acid give a gas which when passed through a solution give the carbonate back on the other hand a gas G that is obtained at anode diring electrolysis brine is passed an dry Y, it give a compound Z, used for disintecting drinking water, Identified X,Y,G and Z

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Solution

Dear student,
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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