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Lewis Kossel Structure

The correct o...

Question

The correct order of melting point of alkali metal chlorides is:

A

N a C l > K C l > C s C l

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B

N a C l > K C l > C s C l

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C

C s C l > K C l > N a C l

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D

C s C l > N a C l > K C l

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Solution

The correct option is A $N a C l > K C l > C s C l$
Melting point depends on lattice energy. Greater the lattice energy, greater is the melting point.
Lattice energy depends on the size of the ions involved. Smaller the internuclear distance, larger the lattice energy.

Hence, the correct order is: $N a C l > K C l > C s C l$

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Lewis Kossel Structure

Standard XII Chemistry

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