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. Also,write the chemical reactions involved.

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Solution

The gas $G$ evolved at anode during electrolysis of brine is chlorine. When chlorine gas is passed through dry $C a (O H)_{2}$ (Y), it produces bleaching powder $Z$ used for disinfecting drinking water.
$C a (O H)_{2}$ + $C l_{2}$ $\to$ $C a O C l_{2}$ + $H_{2} O$
Slaked Bleaching
lime powder
Since $Y$ and $Z$ are calcium salts, therefore $X$ is also a calcium salt and therefore is calcium carbonate.
$C a C O_{3}$ + $2 H C l$ $\to$ $C a C l_{2}$ + $C O_{2}$ + $H_{2} O$
$C a (O H)_{2}$ + $C O_{2}$ $\to$ $C a C O_{3}$ + $H_{2} O$

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