The compound that has the least heat of decomposition among the following is

B e C O_{3}

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M g C O_{3}

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C a C O_{3}

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S r C O_{3}

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Solution

The correct option is A $B e C O_{3}$
Beryllium carbonate is the least stable due to the polarization of larger carbonate ion by the small $B e^{2 +}$ . Hence it has considerable covalent character and can be easily decomposed.

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