Question

Phosphine is prepared from which of the following methods?

• A. By reacting calcium phosphide with water or dilute HCl
• B. By directly reacting phosphorous with hydrogen
• C. By passing dry chlorine over $P_2{H}_4$
• D. Heating white phosphorous with halides

Answer 1

The correct option is A By reacting calcium phosphide with water or dilute HCl

Phosphine is prepared by the reaction of calcium phosphide with water or dilute HCl.
With water: $C{a}_3{P}_2+6H_{2}O\to 2P{H}_3+3Ca(OH{)}_2$
With dilute $HCl$: $C{a}_3{P}_2+6HCl\to 2P{H}_3+3CaC{l}_2$