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In one of the industrial processes used 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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Answer:

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 (Cl_{2} gas)

Y is calcium oxychloride or bleaching powder (CaOCl_{2}).

The equation for the preparation of sodium hydroxide is

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

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

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