The relative thermal stabilities of alkali metal halides are such that:

C s C l > R b C l > K C l > N a C l > L i C l

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L i C l > N a C l > K C l > R b C l > C s C l

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C s C l > R b C l < K C l > N a C l < L i C l

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C s C l < R b C l > K C l < N a C l > L i C l

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Solution

The correct option is A $L i C l > N a C l > K C l > R b C l > C s C l$
Size of cation decide lattice energy and thermal stability.
Smaller size cation have larger polarising power so they have larger lattice energy.
As we move down the group, size increases so lattice energy decreases.
Thus, $L i C l > N a C l > K C l > R b C l > C s C l$

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