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Question: Answered & Verified by Expert
An aqueous solution of an inorganic salt on treatment with $\mathrm{HCl}$ gives a white precipitate. This solution contains
ChemistryPractical ChemistryJEE Main
Options:
  • A $\mathrm{Hg}_2^{2+}$
  • B $\mathrm{Hg}^{2+}$
  • C $\mathrm{Zn}^{2+}$
  • D $C d^{2+}$
Solution:
2980 Upvotes Verified Answer
The correct answer is: $\mathrm{Hg}_2^{2+}$
$\mathrm{Hg}_2^{2+}$ will produce white pot with dill $\mathrm{HCl}$.
$\mathrm{H}_{\mathrm{g}_2}^{+2}+2 \mathrm{HCl} \rightarrow \underset{\text { (White ppt) }}{\mathrm{H}_{g_2} \mathrm{Cl} 2 \downarrow+2 \mathrm{H}^{+}}$
This precipitation is possible due to very low value of the solubility products,

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