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  • 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,

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.

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Answer:

X is calcium carbonate and the gas evolved is carbon dioxide, when calcium carbonate reacts with acid

CaCO_{3}+Dil.2HCl\rightarrow CaCl_{2}+H_{2}O+CO_{2}

Solution Y is lime water Ca\left ( OH \right )_{2}  because, when CO_{2} is passed through it, it gives the carbonate back as shown by the given equation.

Ca\left ( OH \right )_{2}+CO_{2}\rightarrow CaCO_{3}+H_{2}O

The gas evolved at anode during electrolysis of brine is chlorine (G)

Electrolysis   2NaCl+2H_{2}O\rightarrow 2NaOH+Cl_{2}(g)+H_{2}(g)

When chlorine gas is passed through dry Ca(OH)_{2}(Y), it produces bleaching powder (Z), used for disinfecting drinking water.

Ca(OH)_{2}+Cl_{2}\rightarrow CaOCl_{2}+H_{2}O

Hence, Z is calcium oxy-chloride \left ( CaOCl_{2} \right ) or bleaching powder.

 

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