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Question

For the purpose of systematic qualitative analysis, cations are classified into various groups on the basis of their behavior against some reagents. The group reagents used for the classification of most common cations are hydrochloric acid, hydrogen sulphide, ammonium hydroxide, and ammonium carbonate. Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not.

An aqueous solution contains Hg2+, Hg2+2, Pb2+ and Cd2+. The addition of 2MHCl will precipitate :

A
HgCl2 only
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B
PbCl2 only
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C
PbCl2 and Hg2Cl2
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D
PbCl2 and CdCl2
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Solution

The correct option is C PbCl2 and Hg2Cl2
Option (C) is correct.
The addition of 2MHCl will precipitate PbCl2 and Hg2Cl2.
2MHCl is group reagent for group I cations. PbCl2 and Hg2Cl2 will get precipitated, as their solubility products (Ksp) are less than that of other radical.

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