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(A) The melting point of ionic compounds is primarily determined by their lattice energy. Lattice energy is inversely proportional to the interionic d

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$NaCl$

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(A) The melting point of ionic compounds is primarily determined by their lattice energy. Lattice energy is inversely proportional to the interionic distance $(U \propto \frac{1}{r_+ + r_-})$. Among the given alkali metal chlorides,$LiCl$ has the smallest cation size,but it exhibits significant covalent character due to Fajan's rule,which lowers its melting point. $NaCl$ has a high lattice energy and a stable crystal structure,resulting in the highest melting point among the options provided.

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

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