Question

The pair(s) of ions where BOTH the ions are precipitated upon passing $H_{2}S$ gas in presence of dilute $HCl$ is/are:

• A. $B{a}^{2+},Z{n}^{2+}$
• B. $B{i}^{3+},F{e}^{3+}$
• C. $C{u}^{2+},P{b}^{2+}$
• D. $H{g}^{2+},B{i}^{2+}$

Answer 1

Answer: (C), (D)

The correct options are
C $C{u}^{2+},P{b}^{2+}$
D $H{g}^{2+},B{i}^{2+}$

Precipitate is formed on passing $H_{2}S$ in acidic medium i.e., the ion must belong to group II.
$C{u}^{2+},P{b}^{2+},H{g}^{2+},B{i}^{3+}$