Question

The oxidation number of phosphorus in $P{O}_4^{3-},P_4{O}_{10}$ and $P_2{O}_7^{4-}$ is:

• A. 3
• B. 2
• C. -3
• D. 5

Answer 1

The correct option is D 5

The structure of $P{O}_4^{3-},P_4{O}_{10}$ and $P_2{O}_7^{4-}$ are given below:
In ecah of these, the oxidation state of P is $+5$.