A) By heating phosphorus in a current of hydrogen
B) By heating white phosphorus with aqueous solution of caustic potash
C) By decomposition of \[{{P}_{2}}{{H}_{4}}\] at \[{{110}^{o}}C\]
D) By heating red phosphorus with an aqueous solution of caustic soda
Correct Answer: B
Solution :
\[\underset{\text{White}}{\mathop{{{P}_{4}}}}\,+3NaOH+3{{H}_{2}}O\,\to \,\underset{\text{Phosphine}}{\mathop{P{{H}_{3}}}}\,+3Na{{H}_{2}}P{{O}_{2}}\]
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