The halide is iodine as it gives pale yellow precipitate with AgNO3 ..The precipitate is AgI.This makes complex WITH CONC NH3 i.e. [Ag(NH3)2]+ WHICH GIVES precipitate Another test to confirm identity of iodide is addition of conc H2S04..which gives fumes of HI and purple iodine vapours.. Solution The halide is iodine as it gives pale yellow precipitate with AgNO3 ..The precipitate is AgI.This makes complex WITH CONC NH3 i.e. [Ag(NH3)2]+ WHICH GIVES precipitate Another test to confirm identity of iodide is addition of conc H2S04..which gives fumes of HI and purple iodine vapours...