Question

Phosphine is generally prepared in the laboratory by:

• A. Heating phosphorous in a current of hydrogen
• B. Heating white phosphorous with aqueous solution of caustic soda
• C. Decomposition of $P_2{H}_4$ at ${110}^{\circ }C$
• D. Heating red phosphorous with an aqueous solution of caustic soda

Answer 1

The correct option is B Heating white phosphorous with aqueous solution of caustic soda

Phosphine is generally prepared in the laboratory by heating white phosphorous with aqueous solution of caustic soda.
$\underset{White}{P_4\left(s\right)}+3NaOH\left(aq\right)+3H_{2}O\left(l\right)\to P{H}_3\left(g\right)+3Na{H}_{2}P{O}_2\left(aq\right)$