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Question:

Bleaching powder and bleach solution are produced on a large scale and is used in several household products. The effectiveness of bleach solution is often measured by iodometry. Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is:

Cl2O7

Cl2O6

Cl3O9

Cl2O3

Cl3O5

Cl2O

ClO2

Cl2O5

Solution:

Bleaching powder is Ca(OCl)Cl. So, bleaching powder contains a salt of HOCl. Cl2O is an anhydride of HOCl. Cl2O + H2O → 2HOCl. Hence, option A is correct.