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Question: The oxide, which is best soluble in \(H_{2}O\) is....

The oxide, which is best soluble in H2OH_{2}O is.

A

Ba(OH)2Ba(OH)_{2}

B

Mg(OH)2Mg(OH)_{2}

C

K+,HCO3−K^{+},HCO_{3}^{-}

D

Ca(OH)2Ca(OH)_{2}

Answer

Ba(OH)2Ba(OH)_{2}

Explanation

Solution

Ba(OH)2>Sr(OH)2>Ca(OH)2>Mg(OH)2Ba(OH)_{2} > Sr(OH)_{2} > Ca(OH)_{2} > Mg(OH)_{2}

Solubility decreasing order.