p-Block elementsHard

Question

Bleaching of a fabric cloth is done using A and excess of chlorine is removed using B. A and B are :

Options

A.CaOCl2, Na2SO3
B.Na2S2O3, CaOCl2
C.CaCl2, Na2S2O3
D.CaOCl2, Na2S2O3

Solution

CaOCl2 acts as bleaching agent while Na2S2O3 acts as antichlor according to the following reaction.
       CaOCl2 + H2O → Ca(OH)2 + Cl2.
   Na2S2O3 + 4Cl2 + 5H2O → 2NaHSO4 + 8HCl.

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