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

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{Cl}_{2} O

{Cl}_{2} O_{7}

{ClO}_{2}

{Cl}_{2} O_{6}

answer is A.

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Detailed Solution

concept - The bleaching agent is the substance used to remove the colour from fabric or fibre or stains. The basic function of a bleaching agent is to decolourize other substances.
It is an oxidation process.
The chemical name of the bleaching powder is Calcium oxychloride and the chemical formula of the bleaching powder is

CaO {Cl}_{2}

.
When chlorine reacts with water, oxygen is produced. The resulting oxygen combines with the coloured substances present in organic matter and oxidises them into colourless substances.

Cl + H_{2} O \to HCl + HClO

HClO \to HCl + [O]

Colouring substance + [O] → Colourless substance
HCl → Hydrochloric acid
HClO → Hypochlorous acid
So, Calcium oxychloride is the salt of hypochlorous acid HOCl.