Question

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.​

Answer 1

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)

Answer 2

X is NaCl

Y is Ca(OH)2

G is carbon dioxide

Z is Chlorine