Which of the following has highest thermal stability ?

B a C l_{2}

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C a C l_{2}

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M g C l_{2}

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B e C l_{2}

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Solution

The correct option is D $B e C l_{2}$
In salts of monatomic anion, thermal stability is directly proportional to lattice energy i.e. smaller is interatomic distance higher is the thermal stability. So $B e C l_{2}$ which has the smallest cation has the highest lattice energy and hence has highest thermal stability.

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