Question on: JAMB Chemistry - 1990

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 Option: A

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