In group separation, before precipitatin...

In group separation, before precipitating out group III metal ions as hydroxides, it is necessary to boil then solution of the salt mixture with a few drops of concentrated `HNO_(3)` is treated. This is done to convert:

`Co^(3+)` to `Co^(3+)`

`Fe^(2+)` to `Fe^(3+)`

`Mn^(3+)` to `MnO_(4)^(-)`

`Cr^(3+)` to `CrO_(4)^(2-)`

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