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The P-Block Elements

Question
CBSEENCH12006680

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

Solution

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.