$PCl_5$ reacts with finely divided silver on heating and a white silver salt is obtained,which dissolves on adding excess aqueous $NH_3$ solution. Write the reactions involved to explain what happens.

(N/A) $PCl_5$ acts as a chlorinating agent and oxidizes finely divided silver $(Ag)$ to silver chloride $(AgCl)$.
$PCl_5 + 2Ag \rightarrow 2AgCl + PCl_3$
The white precipitate of $AgCl$ dissolves in excess aqueous $NH_3$ due to the formation of a soluble diamminesilver$(I)$ chloride complex.
$AgCl + 2NH_3 \rightarrow [Ag(NH_3)_2]Cl$
(white precipitate) $\quad$ (soluble complex)