Write balanced chemical equations for the conversion of `CrO_(4)^(2-)` to `Cr_(2)O_(7)^(2-)` in acidic medium and `Cr_(2)O_(7)^(2-)` to `CrO_(4)^(2-)` in basic medium.

Explanation

In acids medium
`2K_(2)CrO_(4)+2HCl rarr K_(2)Cr_(2)O_(7)+2KCl+H_(2)O`
In basic medium
`K_(2)Cr_(2)O_(7)+2KOH rarr 2K_(2)CrO_(4)+H_(2)O`
`rArr underset(("Orange-red"))(Cr_(2)O_(7)^(2-))+H_(2)OhArr underset(("Yellow"))(2CrO_(4)^(2-))+2H^(+)`