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WAEC - Chemistry (1990 - No. 19)
In the reaction represented by the equation; 2FeCI
3
+ SO
2
+ 2H
2
O → 2FeCL
2
+ H
2
SO
4
+ 2HCI the oxidation number of sulphur changes from
+2 to + 6
+ 4 to + 6
0 to + 6
- 2 to + 4
+2 to + 4
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