What is the valency of phosphorus in $P H_{3}$ ?

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Solution

The correct option is C $+ 3$
The valence (or valency) of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules.
In $P H_{3}$ , $P$ is combined to 3 $H$ atoms, so the valency of phosphorous is $+ 3.$

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