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A metal carbonate X on reacting with an...

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, it gives a compound Z, used for disinfecting drinking water . Identify 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 bleaching powder (Z) used for disinfecting drinking water.
`underset("Slaked lime")(Ca(OH)_2)+Cl_(2)rarrunderset("Bleaching powder")(CaOCl_2)+H_(2)O`
Since Y and Z are calcium salts , therefore X is also a calcium salt and is calcium carbonate.
`CaCO_3+2HCl rarr CaCl_(2) + CO_(2)+H_(2)O`
`Ca(OH)_2+CO_(2) rarrCaCO_(3)+H_(2)O` .
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