The correct order of solubility in water is:

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(D) $1$. $CaCO_3$ is an alkaline earth metal carbonate,which is generally insoluble in water due to high lattice energy.$2$. Between $NaHCO_3$ and $KH

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$CaCO_3 < NaHCO_3 < KHCO_3$

Vedclass · Answer

(D) $1$. $CaCO_3$ is an alkaline earth metal carbonate,which is generally insoluble in water due to high lattice energy.$2$. Between $NaHCO_3$ and $KHCO_3$,both are alkali metal bicarbonates. Solubility of alkali metal salts generally increases down the group due to the decrease in lattice energy being more significant than the decrease in hydration energy.$3$. Therefore,the solubility order is $CaCO_3 < NaHCO_3 < KHCO_3$.

List-$I$	List-$II$
$A$. Alkali metals	$I$. $ns^2 np^6$
$B$. Alkaline earth metals	$II$. $ns^1$
$C$. Halogens	$III$. $ns^2 np^5$
$D$. Noble gases	$IV$. $ns^2$

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Match the following:
List-$I$ List-$II$
$A$. Alkali metals $I$. $ns^2 np^6$
$B$. Alkaline earth metals $II$. $ns^1$
$C$. Halogens $III$. $ns^2 np^5$
$D$. Noble gases $IV$. $ns^2$

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