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Question

Which of the following alkali metal chlorides is expected to have the highest melting point?

A
LiCl
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B
NaCl
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C
KCl
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D
RbCl
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Solution

The correct option is B NaCl
Although lattice energy if LiCl is higher than that of NaCl butr LiCl is covalent in nature and NaCl is ionic. After NaCl, lattice energy decreases as the size of the alkali metal ion increases. As melting point depends upon lattice energy and ionic/covalent nature of the compound, NaCl has the highest melting point.

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