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A reagent is added to a solution of mang...

A reagent is added to a solution of manganous salt in cold dil. `HNO_(3)`. A purple colour appeared due to the formation of permanganic acid. The reagent is:

A

`NaBiO_(3)`

B

`(NH_(4))_(2)C_(2)O_(4)`

C

`H_(2)O_(2)`

D

`KNO_(3)`

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