P + O₃-------) P₂O₅ + O₂
balancee yheequation by oxidation number method

Dear Student,

Please find below the solution to the asked query:

Skeletal reaction: P + O₃ ----> P₂O₅ + O₂
Oxidation No.      0     0          +5  -2    0

Here, P oxidises from 0 to +5 and O reduces from 0 to -2.

So, the increase in oxidation number of +5 per atom can be balanced with decrease in oxidation number of -2 per atom if P atoms are multiplied by 2 and O₃ by 5.

The equation then will be:  2P + 5O_​3 ---> P₂O₅ + 5O₂

Hope this information will clear your doubts about Redox Reactions.
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