Which of the following silver halides dissolves readily in dilute aqueous ammonia?

A $AgCl$
B $AgBr$
C $AgI$
D $AgI$ and $AgBr$ equally

Answer: A

AgCl forms the soluble complex

[Ag (NH X_{3}) X_{2}] X^{+}

in dilute ammonia. AgBr dissolves only in conc. ammonia and sparingly, and AgI is insoluble even in conc. ammonia because its solubility product is far smaller.

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