Colourless salt (A)+dil.H(2)SO(4) or CH(...

Colourless salt `(A)`+dil.`H_(2)SO_(4)` or `CH_(3)COOH + KI to` blue colour with starch. `(A)` can be

A

`K_(2)SO_(3)`

B

`Na_(2)CO_(3)`

C

`NH_(4)NO_(3)`

D

`NH_(4)Cl`

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The correct Answer is:

C

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