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Question

In one of the industrial processes for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reactions involved.

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Solution

In the manufacture of sodium hydroxide, hydrogen gas and chlorine gas (X) are formed as by-product. Chlorine gas reacts with lime water to give bleaching powder, a bleaching agent. Thus, X is chlorine gas (Cl2) gas.

Y is calcium oxychloride or bleaching powder CaOCl2.

The equation for the preparation of sodium hydroxide is:

2NaCl (aq)+2H2O (l)Heat2NaOH (aq)+Cl2(g)+H2(g)

Cl2(g)+Ca(OH)2(aq)CaOCl2(aq)+H2O(l)

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