1.

The coloured spotofKMnO_(4) on any article can be bleached by

Answer»

`SO_(2)+H^(+)`
`C_(2)O_(4)^(2-)+H^(+)`
`H_(2)O_(2)+H^(+)`
all of these

Solution :`KMnO_(4)` in presence of `H^(+)` ionscan be reduced to colourless `MN^(2+)` by all the GIVEN chemicals.


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