In one of the industrial processes for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with dry slaked lime 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 manufacturing of sodium hydroxide, hydrogen gas and chlorine gas (X) are formed as by-products. Chlorine gas reacts with dry slaked lime 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:

$2NaCl (aq) + 2 H_{2} O (l) Heat \to 2 NaOH (aq) + {Cl}_{2} (g) + H_{2} (g)$

${Cl}_{2} (g) + {Ca(OH)}_{2} (s) \to {CaOCl}_{2} (aq) + H_{2} O(l)$

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X

is formed as a by-product. The gas

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reacts with lime water to give a compound

Y

which is used as a bleaching agent in the chemical industry. Identify

X

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Y

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