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What are the oxidation numbers of the fo...

What are the oxidation numbers of the following ?
(a) Cr in `CrO_4^(2-)` (b) C in `C_6H_(12)O_6`
(c) I in `IF_7` (d) O in `O_3`

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The correct Answer is:
(a) +6, (b) 0, (c) +7, (d) 0
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