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

B a^{2 +}, Z n^{2 +}

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B i^{3 +}, F e^{3 +}

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C u^{2 +}, P b^{2 +}

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H g^{2 +}, B i^{2 +}

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Solution

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.
$C u^{2 +}, P b^{2 +}, H g^{2 +}, B i^{3 +}$

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