|Class 12 Chemistry P Block Elements||Phosphine|
Its molecular formula is PH3
Its structure is:
It is prepared by dropping water on calcium phosphide.
Lab preparation: By disproportionate reaction
This phosphine produced can be purified by reacting it with HI to get PH4I and then this PH4I react with KOH to form pure PH3 ,KI and water.
Uses of phosphine:
(a) Combustion of PH3is used in Holmes’s signals for ships.
(b)It is also used as smoke screens in warfare.