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Cr2O7 + 6Fe2+ + 14H+

Cr2O7 + 6Fe2+ + 14H+ → 2Cr3+ +6Fe3+ + 7H2O. In the above , the oxidation number of chromium changed from?

A.

+7 to +3

B.

+6 to +3

C.

+5 to +3

D.

-2 to +3

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Correct answer is A

No explanation has been provided for this answer.

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