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JAMB - Chemistry (1990 - No. 3)
Cr
2
O
7
+ 6Fe
2+
+ 14H
+
→ 2Cr
3+
+6Fe
3+
+ 7H
2
O. In the above , the oxidation number of chromium changed from?
+7 to +3
+6 to +3
+5 to +3
-2 to +3
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