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Question on: JAMB Chemistry - 1995

Cr2O72-(aq) + 14H+(aq) + 6l-(aq) → 2Cr3+(aq) + 3l(g) + 7H2O(I).
The change in the oxidation number of oxygen in the equation above is?
A
0
B
1
C
2
D
7
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Correct Option: A

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