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  4. The oxidation number of phosphorus in PCl 5, P 2 O 5 and H 2 PO 3 respectively are

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Q. The oxidation number of phosphorus in $PCl _{5}, P _{2} O _{5}$ and $H _{2} PO _{3}$ respectively are

Redox Reactions

Solution:

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Thus, the oxidation number of $P$ in $PCl _{5}, P _{2} O _{5}$ and $H _{2} PO _{3}$ is $+5,+5$ and $+4$, respectively.