Answer:
X
is calcium carbonate and the gas evolved is carbon dioxide, when calcium carbon
reacts with acid.
Solution Y is lime water
because,
when
is passed
through it, it gives the carbonate back as shown by the given equation.
The gas evolved at anode during
electrolysis of brine is chlorine (G).
When chlorine gas is passed through dry
(Y), it
produces bleaching powder (Z), used for disinfecting drinking water.
Hence, Z is calcium oxy-chloride (CaOCl2)
or bleaching powder.
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