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Which of the following is least soluble in water ?

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${TeO}_{2}$

${SO}_{2}$

${PoO}_{2}$

${SeO}_{2}$

answer is B.

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Detailed Solution

More the size difference between anion and cation, more will be the solubility.

Oxide ion is considered to be small ion. We know that as we move from top to bottom size increases in a group.

Therefore the size difference between anion and cation is greater in ${PoO}_{2}$ and is the most soluble whereas ${SO}_{2}$ the difference is less.

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