Q45Short answer
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.
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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. 2 Ca(OH)2 + 2 Cl2 o Ca(ClO)2 + CaCl2 + 2H2O Slaked Bleaching lime powder Since Y and Z are calcium salts, therefore X is also a calcium salt and is calcium carbonate. CaCO3 + 2HCl o CaCl2 + CO2 + H2O Ca(OH)2 + CO2 o CaCO3 + H2O ANSWERS 125