NaF is the highest melting halide because it | vedclass

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(B) The melting point of an ionic compound is directly proportional to its ionic character. According to Fajan's rule,the polarizing power of a cation

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Maximum ionic character

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(B) The melting point of an ionic compound is directly proportional to its ionic character. According to Fajan's rule,the polarizing power of a cation is small and the polarizability of the anion is small when the electronegativity difference between the bonded atoms is large. In $NaF$,the electronegativity difference between $Na$ $(0.9)$ and $F$ $(4.0)$ is the largest among alkali metal halides,resulting in the maximum ionic character. Therefore,$NaF$ has the highest melting point.

$NaF$ is the highest melting halide because it is the most ionic in nature. This is because the chosen halide has:

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