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Reactivity with Halogens and Hydrogen (Group 2)

Hg Cl 2 is a ...

Question

$H g {C l}_{2}$ is a covalent compound, sparingly soluble in water, the solubility increases by the addition of chloride ions due to:

common ion effect

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formation of complex

{[H g {C l}_{4}]}^{2 -}

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weakening of

H g - C l

bonds

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strong ion-dipole forces

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Solution

The correct option is B formation of complex ${[H g {C l}_{4}]}^{2 -}$
When chloride ions are added to sparingly soluble mercuric chloride, water soluble ${[H g {C l}_{4}]}^{2 -}$ complex is obtained. This increases the solubility.
$H g C l_{2} + 2 C l^{-} \to {[H g {C l}_{4}]}^{2 -}$

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