The oxidation state of phosphorus is minimum in

P_{4} O_{6}

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N a H_{2} P O_{2}

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P H_{3}

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N a_{3} P O_{4}

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Solution

The correct option is C $P H_{3}$
In phosphine, the phosphorus atom has $- 3$ oxidation state as hydrogen has $+ 1$ oxidation state.

In all other compounds, phosphorus has a positive oxidation state.

The oxidation state of phophorus in $P_{4} O_{10}, N a H_{2} P O_{2}$ and $N a_{3} P O_{4}$ are $+ 3, + 1$ and $+ 5$ respectively.

Thus, the oxidation state of phosphorus is minimum in phosphine.

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