Which compound has the lowest melting point?

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(A) Among the given alkali metal chlorides,$LiCl$ has the lowest melting point.This is primarily due to the significant covalent character in the $Li-

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$LiCl$

Vedclass · Answer

(A) Among the given alkali metal chlorides,$LiCl$ has the lowest melting point.This is primarily due to the significant covalent character in the $Li-Cl$ bond,which arises from the high polarizing power of the small $Li^+$ ion (Fajans' rule).While lattice energy generally decreases down the group,the covalent nature of $LiCl$ results in a lower melting point compared to the other ionic alkali metal chlorides like $KCl$,$RbCl$,and $CsCl$.Hence,option $A$ is correct.

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