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The oxidation state of Cr in Cr(2)O(7)^(...

The oxidation state of `Cr` in `Cr_(2)O_(7)^(2-)` is

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In acidic medium, H_(2)O_(2) changes Cr_(2)O_(7)^(2-) ion to CrO_(5) . The oxidation states of Cr in Cr_(2)O_(7)^(2-) and CrO_(5) are respectively :

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Write oxidation number of Cr in Cr_(2)O_(7)^(2–) .