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Formation of Salts

Bleaching pow...

Question

Bleaching powder and bleach solution are produced on a large scale and 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

A

C l_{2} O

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B

C l_{2} O_{7}

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C

C l O_{2}

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D

C l_{2} O_{6}

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Solution

The correct option is A $C l_{2} O$
Bleaching powder is Ca(OCl)Cl. Therefore, the oxoacid whose salt is present in bleaching powder is HOCl.
Anhydride of HOCl is $C l_{2} O$ as
$2 H O C l \to C l_{2} O + H_{2} O$

Note: The oxidation number of element in anhydride and oxoacid remains the same.

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