White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of

The white precipitate silver chloride is soluble in ammonia and forms the complex with coordination number 2. The complex formation is shown below.

$\mathrm{AgCl}\left(\mathrm{s}\right)+2{\mathrm{NH}}_3\left(\mathrm{aq}\right)\to \left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\right]\mathrm{Cl}\left(\mathrm{aq}\right)$

It is ammoniacal silver chloride.