Sodium hydroxide manufactured in industries using chlor-alkali process. In this process a gas X is formed as a by-product. This gas reacts with lime water to give a compound Y, which is used as a bleaching agent in the chemical industry. What is compound Y ?

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Calcium hydroxide

Calcium oxychloride

Sodium hydroxide

Sodium oxychloride

answer is B.

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Detailed Solution

Concept- The industrial manufacturing process for NaOH involves electrolysis of brine which is basically common salt dissolved in water. The process is chlor-alkali process.
Brine is basically NaCl(aq) and its electrolysis leads to its decomposition for which the chemical reaction can be written as follows:

As it is evident that during manufacturing of NaOH that it is an alkali,

gas is also produced as a by-product giving the name chlor-alkali to the process. So, we can conclude that X is Chlorine gas,

.
It is given that

reacts with lime water for which we have chemical formula

and the reaction between the two can be shown by the following chemical equation:

We know that

is called bleaching powder for its bleaching properties. Thus, Y is calcium oxychloride,

.
Hence, the correct option is (2).

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