4- A metal carbonate X on heating 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.
What is the nature of the gas evolved when X is heated?
Write the reaction involved in the formation of G.
Write the reaction involved when G reacts with Y.
Answers
Explanation:
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. Answer: Calcium carbonate gives carbon dioxide gas when reacts with hydrochloric acid.
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Acid Base and Salt
NCERT Exemplar Solution Long Answer 2
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.
Answer: Calcium carbonate gives carbon dioxide gas when reacts with hydrochloric acid.
CaCO3 + 2HCl ⇨ CaCl2 + CO2 + H2O
Carbon dioxide turns lime water milky when passed through it because of formation of calcium carbonate. When carbon dioxide; so formed; is passed through lime water, lime water turns milky because of the formation of calcium carbonate.
CO2 + Ca(OH)2 ⇨ CaCO3 + H2O
On the electrolysis of brine, chlorine gas is deposited over anode which gives calcium oxychloride (Bleaching powder) on passing over slaked lime. The bleaching powder is used in disinfecting the drinking water.
Ca(OH)2 + Cl2 ⇨ CaOCl2 + H2O
Bleaching powder is used for disinfecting drinking water.
Therefore;
Metal carbonate ‘X’ is calcium carbonate.
Solution ‘Y’ is lime water (Calcium hydroxide).
Gas ‘G’ is chlorine gas.
Dry ‘Y’ is dry calcium hydroxide (dry slaked lime).
Compound ‘Z’ is bleaching powder (Calcium oxychloride).