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.


  • X is calcium carbonate (CaCO3)
  • Y is slaked lime
  • Z is bleaching powder (CaOCl2)
  • G is chlorine gas

X is Calcium. When calcium carbonate reacts with HCl, it gives out CO2 gas.

CaCO3 + HCl → CaCl2 + CO2 + H2O

When CO2 is passed into lime water, it turns milky due to the formation of Calcium carbonate.

Hence, solution Y is lime water

When chlorine gas is passed on dry lime water, it gives bleaching powder which is used for disinfecting water.

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