Question

Phosphine is generally prepared in the laboratory :

• A. By heating phosphorus in a current of hydrogen
• B. By heating white phosphorus with an aqueous solution of caustic potash
• C. By decomposition of $P_2H_4$ at $110^°C$
• D. By heating red phosphorus with an aqueous solution of caustic soda

Answer 1

Answer: (B)

$\underset{\text{White}}{\ce{P4}}$$\ce{+3NaOH + 3H O->}$$\underset{\text{Phosphine}}{\ce{PH3}}$$\ce{+ 3NaH2PO2}$