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

Li and Mg shows similarities in physical and chemical properties due to diagonal relationship.
(2) Li is the harder element among all the alkalimetals due to strong metallic bond.
(3) LiCl is deliquescent and crystallises as dihydrate LiCl. 2H2O but not monohydrate LiCl. H2O.
(4) Down the group, size of cations increases, and hydration enthalpy decreases.
${B e}^{+ 2} > {M g}^{2 +} > {C a}^{+ 2} > {S r}^{+ 2} > {B a}^{+ 2}$