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In acidic medium MnO(4)^(2-)...

In acidic medium `MnO_(4)^(2-)`

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(a) `CuF_(2)` (b) (i) Cr in `CrO_(4)^(2-)` is in the highest oxidation state, i.e., `+6` while Mn in `MnO_(4)^(2-)` is in oxidation state`+6` and its most stable oxidation state is`+7` (ii) due to lanthanoil contraction (iv) `Mn^(2+)` has `3d^(5) ` configuration
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