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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X is CaCO3 (Calcium Carbonate)
Now, we know that metal carbonate reacts with acid to give metal salt, Carbon-dioxide and water.
Y is Ca(OH)2 (Calcium hydroxide)
Ca(OH)2 + CO2 -----> CaCO3 + H2O
G is Cl2 (Chlorine gas)
Cl2+ Ca(OH)2 -----> CaOCl2 +H2O
So, Z is CaOCl2 (Bleaching powder)
X is NaCl
Y is Ca(OH)2
G is carbon dioxide
Z is Chlorine