CBSE Class 10 Science 2019 · Paper 31/5/3 · Question 12
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
A is chlorine gas, , and B is bleaching powder, , formed when chlorine reacts with calcium hydroxide.
A is chlorine gas, , and B is bleaching powder, (calcium oxychloride).
Chlor-alkali process (electrolysis of brine):
Formation of bleaching powder:
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