Which one is the highest melting halide?

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Question

(C) The correct answer is $(C)$. $NaF$ has the highest melting point among the given halides. According to Fajan's rule,as the size of the anion incre

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$NaF$

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(C) The correct answer is $(C)$. $NaF$ has the highest melting point among the given halides. According to Fajan's rule,as the size of the anion increases,the covalent character increases,and the ionic character decreases. Since the fluoride ion $(F^-)$ is the smallest among the halides,$NaF$ has the maximum ionic character and the strongest electrostatic forces of attraction,leading to the highest melting point.

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