Melting point is low for :

calcium fluoride

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calcium iodide

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calcium Chloride

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calcium bromide

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Solution

The correct option is A calcium iodide
Greater the size of anion, greater is its polarizability. Hence, higher is the covalent character. And lower is the melting point.
According to fajan's rule calcium iodide will be having highest covalent character because of large size of iodide ion.
so, melting point of calcium iodide will be lowest in all given options.
Hence, option B is correct answer.

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