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

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$K_{2} {CO}_{3}$

${CaCO}_{3}$

${KHCO}_{3}$

$Ca {({HCO}_{3})}_{2}$

answer is D.

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Detailed Solution

Due to a rise in lattice and a decrease in hydration energy, solubility declines along the group. ${CaCO}_{3}$ is therefore the least soluble in water.

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