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An aqueous solution of salt containing a...

An aqueous solution of salt containing an acidic radical `X`-reacts with sodium hypochlorite in neutral medium. The gas evolved produces blue black colour spot on the starch paper.The anion `X^(-)` is:

A

`CH_(3)COO^(-)`

B

`Br^(-)`

C

`I^(-)`

D

`NO_(2)^(-)`

Text Solution

Verified by Experts

The correct Answer is:
C
`OCl^(-)+3l^(-)+H_(2)Otol_(3)^(-)+2OH^(-)+Cl^(-)`
`l_(3)^(-)+` starch `to` blue-black spot on starch paper due to the formation of iodine-starch adsorption complex.
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