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An aqueous solution contains Hg^(2+),Hg(...

An aqueous solution contains `Hg^(2+),Hg_(2)^(2+),Pb^(2+) and Cd^(2+)` Out of these how many ions will produce white precipitate with dilute HCl ?

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The correct Answer is:
3
`Pb^(2+)+2Cl^(-)toPbCl_2darr(white), Hg_2^(2+)+2Cl^(-)toHg_2Cl_2darr`(white)
`Ag^(+)+Cl^(-)toAgCldarr`(white)
`K_(sp)` of chlorides of `Pb^(2+)` and `Hg_2^(2+)` is low as compared to `K_(sp)` of `Hg^(2+)` and `Cd^(2+)` . Chloride ion concentration provided by dilute H Cl is just enough to exceed the `K_(sp)` of `PbCl_2` and `Hg_2Cl_2` Thus `Pb^(2+)` and `Hg_2^(2+)` are precipitated as their chlorides
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