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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)CO O^(-)`

B

`Br^(-)`

C

`l^(-)`

D

`NO_(2)^(-)`s

Text Solution

Verified by Experts

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