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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) → 2P2O5(g)
0 to + 2
0 to 5
+4 to + 2
+4 to +5
+4 to +7

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