The chloride ion is detected by the formation of a white precipitate of AgCl on addition of aqueous AgNO3 solution and by the dissolution of the precipitate on addition of excess ammonia solution. AgCl dissolves in aqueous ammonia due to the formation of water soluble :
(A) [Ag (NH4)2 ]+ , (B) [Ag (NH3)2 ]+ , (C) [Ag(NH2)2 ] – , (D) [Ag (OH)2 ] –