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Question

Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point ?


A
RbCl
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B
KCl
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C
NaCl
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D
LiCl
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Solution

The correct option is C NaCl
LiCl has partly covalent character. Other halides are ionic in nature. Lattice energy decreases with increase of ionic radius of cation, anion being the same. Larger is the lattice energy, the higher will be melting point hence NaCl will have highest melting point.

Chemistry

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