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Give examples and suggest reasons for the following features of the transition metals.
The highest oxidation state is exhibited in oxoanions of a metal.

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This is also due to high electronegativity of oxygen eg. : chromium exhibits oxidation states of +6 in oxoanion `[CrO_(4)]^(2-)` and manganese shows oxidfition state of +7 in oxoanion `[MnO_(4)]^(-)`.
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