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. Justify X,Y,G and Z.
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Answer. X is Calcium carbonate (CaCO3). Y is Lime water Ca(OH)2 or slaked lime. When this CO2 gas is passed through Lime water , the lime water turns milky due to the formation of Calcium Carbonate and thus it is formed again
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Thus, the metal carbonate is calcium carbonate in the reaction. Calcium carbonate gives carbon dioxide gas when it reacts with hydrochloric acid.
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