Question

In an industrial process used for the manufacture of sodium hydroxide, a

gas ‘A’ is formed as a by-product. The gas ‘A’ reacts with lime water to

give a compound ‘B’ which is used as a bleaching agent in the chemical

industry. Identify ‘A’ and ‘B’. Also give the chemical equations of the

reactions involved​

Answer 1

Answer:

Sodium chloride is used for manufacture of sodium hydroxide which is called chloralkali process. In this process chlorine and hydrogen gas are formed as byproducts along with sodium hydroxide. Chlorine gas gives bleaching power when reacts with lime water and used as bleaching agent in chemical industries.

2NaCl(aq)+2H2O(l)→2NaOH(aq)+Cl 2(g)+H 2

X→Cl 2(Chlorine gas)

Ca(OH) 2+Cl 2 ⟶CaOCl2 +H2O

Therefore,

The gas X is chlorine.

Compound Y is calcium oxychloride which is commonly known as bleaching powder and used as bleaching agent in chemical industries.