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PH 3 reacts with acids like HI to form PH 4 I which shows that it is basic in nature. PH 3 , + HI → PH 4 I Due to lone pair on phosphorus atom, PH 3 is acting as a Lewis base in the above reaction.

The p-Block Elements

Question

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In what why it can be proved that PH₃ is basic in nature?

Answer

PH₃ reacts with acids like HI to form PH₄I which shows that it is basic in nature.
PH₃, + HI → PH₄I
Due to lone pair on phosphorus atom, PH₃ is acting as a Lewis base in the above reaction.