What is the change in the oxidation number of phosphorus in the following reaction?

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4P(s) + 5O2(ag) → 2P2O5(s)

A. 0 to 2
B. 0 to 5
C. 4 to 2
D. 4 to 5
E. 4 to 10

Correct Answer:

Option B – 0 to 5

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