1.

Which one of the following species is stable in aqueous solution ?

Answer»

`CR^(2+)`
`MnO_(4)^(2-)`
`MnO_(4)^(3-)`
`Cu^(+)`

SOLUTION :In `MnO_(4)^(2-)` manganese is in + 6 OXIDATION state which is having highest stability .
`MnO_(4)^(2-)` disproptionates in nerutal or acidic solution.
`3 MnO_(4)^(2-) + 4H^(+) rarr 2MnO_(4)^(2) + MnO_(2) + 2H_(2)O`


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