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Oxidation States

Which of the ...

Question

Which of the following is least soluble in $H_{2} O$ ?

A

Ba

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B

Sr

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C

Cr

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D

Mg

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Solution

The correct option is D
Mg

Water is a polar solvent and thus dissolves many ionic compounds.

Among the given compounds, all cations have +2 charge and ${B a}^{2 +}$ has the highest size and ${M g}^{2 +}$ has least size.

Hence, ${M g}^{2 +}$ has highest polarizing power and consequently, $M g F_{2}$ is most covalent.

So, $M g F_{2}$ is the least soluble among the given compounds.

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