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Question

The melting point of NaBr is 682 C while that of NaF is 988 C. The principle reason behind the melting point of NaF being higher than that of NaBr is:


A
The two crystal are not isomorphous
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B
The molar mass of NaF is lower than that of NaBr
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C
The internuclear distance (rc+ra) of NaBr is greater than NaF
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D
The bond in NaBr has a higher covalent character than the bond in NaF
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Solution

The correct option is D The bond in NaBr has a higher covalent character than the bond in NaF
According to Fajan's Rule, it can be concluded that NaF is more ionic in nature. This means that the lattice energy of NaF is very high, thereby giving it an exceptionally high melting point.

Chemistry

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