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WAEC - Chemistry (1992 - No. 15)
What is the change in the oxidation number of phosphorus in the the reaction represented by the following equation? 4P
(s)
+ 5O
(2)
(g)
→ 2P
2
O
5
(g)
0 to + 2
0 to 5
+4 to + 2
+4 to +5
+4 to +7
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