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Q.

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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a

Calcium hydroxide

b

Calcium oxychloride

c

Sodium hydroxide

d

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:
Question ImageAs it is evident that during manufacturing of NaOH that it is an alkali, Question Image 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, Question Image.
It is given that Question Image reacts with lime water for which we have chemical formula Question Imageand the reaction between the two can be shown by the following chemical equation:
Question Image
We know that Question Image is called bleaching powder for its bleaching properties. Thus, Y is calcium oxychloride, Question Image.
Hence, the correct option is (2).
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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 ?