HgCl2 is a covalent compound, sparingly soluble in water, the solubility increases by the addition of chloride ions due to:
A
common ion effect
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B
formation of complex [HgCl4]2−
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C
weakening of Hg−Cl bonds
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D
strong ion-dipole forces
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Solution
The correct option is B formation of complex [HgCl4]2− When chloride ions are added to sparingly soluble mercuric chloride, water soluble [HgCl4]2− complex is obtained. This increases the solubility. HgCl2+2Cl−→[HgCl4]2−