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02/11/2020 6:35 pm
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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, it gives a compound Z, used for disinfecting drinking water. Identify X, Y, G and Z.
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02/11/2020 6:45 pm
'X' is calcium carbonate.
CaCO3(s)('X') + 2HCl(dil) →CaCl2(g) + CO2(g) + H2O(l)
Ca(OH)2('Y') + CO2 → CaCO3(s)('X') + H2O
'Y' is calcium hydroxide.
2NaCl + 2H2O → 2NaOH + Cl2(g)(At anode) + H2(g) (At cathode)
The gas 'G' is chlorine gas which is obtained at anode.
Ca(OH)2 ('Y')+ Cl2 ('G') → CaOCl2('Z') + H2O
'Z' is calcium oxychloride used for disinfecting drinking water.