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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${Cl}_{2}$ and $NaHC O_{3}$ respectively.

${Cl}_{2}$ and $CaOC l_{2}$ respectively.

$H_{2}$ and $NaHC O_{3}$ respectively

$C O_{2}$ and $CaOC l_{2}$ respectively

answer is C.

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Detailed Solution

The reaction of X with lime water occurs as follows:
$C l_{2} + CaC O_{3} \to CaOC l_{2} + C O_{2}$

When sodium hydroxide is formed the gas X will react with lime water milky to give a bleaching agent $CaOC l_{2}$ . So the gas X should be chlorine gas. Compound Y is calcium oxychloride ( $CaOC l_{2}$ ), often known as bleaching powder and utilized as a bleaching agent in the chemical industry.

Hence, the compound X and Y are ${Cl}_{2}$ and $CaOC l_{2}$ respectively.

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