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Polarisability and Fajan's Rule

By Fajan's ru...

Question

By Fajan's rule, covalent character increases with increase in size of the anion. Identify the correct order of melting point of calcium halides.

C a F_{2} < C a C l_{2} < C a B r_{2} < C a l_{2}

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C a C l_{2} < C a F_{2} < C a B r_{2} < C a l_{2}

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C a F_{2} > C a C l_{2} > C a B r_{2} > C a l_{2}

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C a C l_{2} > C a F_{2} > C a B r_{2} > C a l_{2}

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Solution

The correct option is B $C a F_{2} > C a C l_{2} > C a B r_{2} > C a l_{2}$
According to Fajan's rule
Covalent character $\propto$ size of anion
$\propto \frac{1}{m e l t i n g p o i n t} [∵$ Attraction decreases]
Thus, the order of melting point is
$C a F_{2} > C a C l_{2} > C a B r_{2} > C a l_{2}$ .

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