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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K C l > R b C l > C s 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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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 $K C l > R b C l > C s C l > N a C l > L i C l$
Correct option is B
The stability of a compound depends upon its enthalpy of formation, ∆Hf°. The more negative value of ∆Hf°, more stable is the compound. So the stability of alkyl metal chlorides follows the order KCl (-428)>RbCl (-424)>CsCl (-423)>NaCl (-400)>LiCl (-398). The values given in parenthesis are in kJ/mol.

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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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L i C l

N a C l

K C l

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