Class 12 Chemistry P Block Elements Phosphine

Phosphine

Its molecular formula is PH3

Its structure is:

      Class_12_P_Block_Preparation_Of_Structure_Of_Preparation_of_Phosphine

               Phosphine

Preparation

It is prepared by dropping water on calcium phosphide.

Class_12_P_Block_Preparation_of_Phosphine

Lab preparation: By disproportionate reaction

Class_12_P_Block_Lab_Preparation_of_Phosphine

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.

 

Physical properties:

  • It is colorless gas with smell of rotten fish.
  • It is poisonous.
  • It is slightly soluble in water.
  • The solution of phosphine is unstable and decomposes in presence of light.

    Chemical properties

  1. It is weakly basic due to lone pair of electrons.
  2. It undergoes precipitation reaction that is:

    Class_12_P_Block_Chemical_Properties_of_Phosphine

Uses of phosphine:

(a) Combustion of PH3is used in Holmes’s signals for ships.

(b)It is also used as smoke screens in warfare.

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