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Question

Melting point is very high for:

A
KCl
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B
KBr
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C
KI
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D
KF
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Solution

The correct option is D KF
Apply Fajan's Rule. The size of the cation is same in all the compounds. The smallest size of anion is in case of Fluorine. Smaller the anion, more is the ionic character, and hence, higher is the mp.

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