Q.

A gas X is produced as a by-product in one of the industrial procedures used to make sodium hydroxide. The compound Y, which is employed as a bleaching agent in the chemical industry, is produced when the gas X combines with lime water.

The compound X and Y could be?

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a

Cl2 and NaHCO3 respectively. 

b

Cl2 and CaOCl2 respectively.

c

H2 and NaHCO3 respectively

d

CO2 and CaOCl2 respectively

answer is C.

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Detailed Solution

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The reaction of X with lime water occurs as follows:
 Cl2+CaCO3CaOCl2+CO2

When sodium hydroxide is formed the gas X will react with lime water milky to give a bleaching agent CaOCl2. So the gas X should be chlorine gas. Compound Y is calcium oxychloride (CaOCl2), often known as bleaching powder and utilized as a bleaching agent in the chemical industry.

Hence, the compound X and Y are Cl2 and CaOCl2 respectively.

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