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 P2H4 at 110oC

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

Show Answer

Answer:

Correct Answer: B

Solution:

P4White+3NaOH+3H2OPH3Phosphine+3NaH2PO2



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