Preparation, Properties and Uses of Phosphine

Phosphine is prepared by the reaction of

Describe the laboratory method of preparation of phosphine. State three of its properties with equations.

Why does ammonia forms hydrogen bond but ${\mathrm{PH}}_3$ does not?

What happens when phosphine is passed through silver nitrate solution, give equation.

Write the equation for the preparation of phosphine?

Phosphine catches fire because of the presence of _____ as an impurity in it.

(A) ${\mathrm{P}}_2{\mathrm{H}}_4$
(B) ${\mathrm{P}}_2{\mathrm{H}}_5$
(C) ${\mathrm{P}}_2{\mathrm{H}}_6$

Enter your correct answer as A, B or C.