Identify the correct statement from the following.

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Lithium chloride is deliquescent and crystallises as a hydrate, $LiCI . H_{2} O .$

The order of hydration enthalpies of alkaline earth cations

${Be}^{2 +} < {Mg}^{2 +} < {Ca}^{2 +} < {Sr}^{2 +} < {Ba}^{2 +}$

Lithium and Magnesium show some similarities in their physical properties as they are diagonally placed in periodic table.

Lithium is softer among all alkali metals.

answer is C.

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Detailed Solution

LiCl is deliquescent and crystallises from aqueous solution as hydrate, $LiCI . H_{2} O .$
The hydration enthalpies of alkaline earth metal ions decreases with increase in ionic size down the group.
$∴$ Order of hydration enthalpy is

${Be}^{2 +} < {Mg}^{2 +} < {Ca}^{2 +} < {Sr}^{2 +} < {Ba}^{2 +}$

Lithium shows diagonal relationship with magnesium hence, their physical and chemical properties are almost similar.
Lithium is much harder than other alkali metals.

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