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Question

Question: Phosphine is generally prepared in the laboratory....

Phosphine is generally prepared in the laboratory.

A

By heating phosphorus in a current of hydrogen

B

By heating white phosphorus with aqueous solution of

caustic potash

C

By decomposition of P2H4P_{2}H_{4} at 110oC110^{o}C

D

By heating red phosphorus with an aqueous solution of

caustic soda

Answer

By heating white phosphorus with aqueous solution of

caustic potash

Explanation

Solution

P4White+3NaOH+3H2O→PH3Phosphine+3NaH2PO2\underset{\text{White}}{P_{4}} + 3NaOH + 3H_{2}O \rightarrow \underset{\text{Phosphine}}{PH_{3}} + 3NaH_{2}PO_{2}