(a) $Pb^{2-}$
(b) $Cu^{+}$
(c) $Ag^{+}$
(d) $Sn^{2+}$
(1982,1 M)
Correct Answer: 22. (c)
Solution:
$Ag^{+}$ is precipitated by $HCl$ only while all others are precipitated by passing $H _2 S$ in the presence of $HCl$.
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