Question

What will be the products formed when $P{H}_3$ reacts with $A{g}^{+}$ (aq.) ?

Answer 1

Phosphine on reaction with water, forms Phosphorous acid.

$P{H}_3+H_{2}O⟶H_{3}P{O}_3+H_2$

Hence, in $A{g}^{+}\left(aq\right)$ solution, $Ag$ acts as a catalyst.