Analytical ChemistryHard

Question

Which of the following reagents can be used for making the distinction between AgCl and AgI ?

Options

A.Sodium arsenite solution.
B.Dilute ammonia solution.
C.Potassium cyanide solution.
D.Dilute HNO3.

Solution

(A) 3AgCl ↓ + AsO33- →  Ag3AsO3 ↓(yellow) + 3Cl-
AgI is unaffected by this treatment.
(B) AgCl + 2NH3 →  [Ag(NH3)2]Cl
AgI is not soluble in dilute ammonia solution.
(C) Both soluble in potassium cyanide, forming soluble complexes.
(D) Both insoluble in dilute HNO3.

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