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Question

Phosphine is obtained by the reaction when_________.
  1. white phosphorous is heated with NaOH
  2. Ca3P2 reacts with water
  3. red phosphorus is heated with NaOH
  4. phosphorus is heated in current of hydrogen

A
red phosphorus is heated with NaOH
B
phosphorus is heated in current of hydrogen
C
Ca3P2 reacts with water
D
white phosphorous is heated with NaOH
Solution
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When white phosphorus is reacted with phosphorus, the following reaction takes place,

P4 + 3NaOH + 3H2O PH3 + 3NaH2PO2
Phospine Sodium hypophospine

Hence phosphine is formed.

When calcium phosphide (Ca3P2) reacts with water, the following reaction takes place

Ca3P2 + 6H2O 3Ca(OH)2 + 2PH3
Calcim hydroxide Phosphine

So phosphine is formed.

Hence, option A and B is correct.

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