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Question

Knowing that Na+>Mg2+ and S2−>Cl−, predict which compound will be the least soluble in a polar solvent?

A
MgS
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B
Na2S
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C
MgCl2
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D
NaCl
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Solution

The correct option is A MgS
We know that, more the covalent character lower will be the solubility. Compound with smaller cation and larger anion are more covalent in nature. Among these, MgS is more covalent and it is the least soluble in polar solvents.

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