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Consider the following equilibrium AgCl↓ + 2NH3 ⇌ [Ag(NH3)2]^+ + CI^- White precipitate of AgCl appears on adding which of the following?

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Consider the following equilibrium

AgCl↓ + 2NH3 ⇌ [Ag(NH3)2]+ + CI-

White precipitate of AgCl appears on adding which of the following?

(a) NH3

(b) aqueous NaCl

(c) aqueous HNO3

(d) aqueous NH4Cl

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Correct answer: (c) aqueous HNO3

Explanation:

2HNO3(aq) + [Ag(NH3)2]+ + Cl- → AgCl(s)↓ + 2NH4 + 2NO3-

When nitric acid is added to amine solution, solution is made acidic and the complex ion dissociates and liberate silver ion to recombine with chloride ion. This is the confirmatory test for silver in group 1.

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