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Stereoisomerism

An aqueous so...

Question

An aqueous solution contains $H g^{2 +}$ , $H g_{2}^{2 +}$ , $P b^{2 +}$ , and $C d^{2 +}$ . Out of these, how many ions will produce white precipitate with $d i l u t e H C l$ ?

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Solution

Two ions $P b^{2 +}$ and $H g_{2}^{2 +}$ will produce white ppt with dil HCl.
$P b^{2 +} + 2 H C l \to P b C l_{2} ↓ (w h i t e p p t) + 2 H^{+}$
$H g_{2}^{2 +} + 2 H C l \to H g_{2} C l_{2} ↓ (w h i t e p p t) + 2 H^{+}$
This precipitation is possible due to very low value of the solubility products.

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