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Question

Phosphine PH3 cannot be formed by which of the following reactions
  1. Reaction of phosphonium iodide with potassium hydroxide
  2. By heating phosphoric acid
  3. By hydrolysis of Calcium phosphide 
  4. By heating white phosphorus with concentrated sodium hydroxide 


Solution

The correct option is B By heating phosphoric acid
Calcium phosphide on hydrolysis or reaction with dil. HCl gives cacium hydroxide and phosphine
Ca3P2+H2O3Ca(OH)2+PH3
Reaction of phoshoniumiodide on treating with KOH gives
PH4I+KOHKI+H2O+PH3
Phosphoric acid does not decompose to phosphine but phosphorus acid on heating gives:
H3PO3Heat−−H3PO4+PH3

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