P-Block Elements Ques 238
Question: Phosphine is generally prepared in the laboratory
[CPMT 1983, 2003]
Options:
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_2H_4 $ at $ 110^{o}C $
D) By heating red phosphorus with an aqueous solution of caustic soda
Show Answer
Answer:
Correct Answer: B
Solution:
$ \underset{White}{\mathop{P_4}}+3NaOH+3H_2O\to \underset{Phosphine}{\mathop{PH_3}}+3NaH_2PO_2 $
