Discussion Forum



1)

Phosphine is generally prepared in the laboratory:


A) By heating phosphorus in a current of hydrogenBy heating white phosphorus with an aqueous solution ofcaustic potash

B) By heating white phosphorus with an aqueous solution of caustic potash

C) By decomposition of $P_{2}H_{4}$ at 110°C

D) By heating red phosphorus with an aqueous solution of caustic soda

Answer:

Option B

Explanation:

$P_{4}+3NaOH+3H_{2}O\rightarrow PH_{3}+3NaH_{2}PO_{2}$

White                                                   Phosphine