WAEC - Chemistry (2002 - No. 3)

Consider the following equation; Cr2O7(aq)2- + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(I). The oxidation number of chromium changes from
-2 to + 3
- 2 to + 6
+ 6 to + 3
+ 7 to + 6

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