Which is decomposed most easily?

C a C O_{3}

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M g C O_{3}

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B a C O_{3}

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Equally

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Solution

The correct option is D $M g C O_{3}$
$M C O_{3} \to M O + C O_{2} - 394.4$
$M g - 1028.2 - 568.9 64.9 C a - 1129.2 603.4 165.9 B a - 1134.4 - 520.4 219.6$
As second value is negative for both Ba and Ca so they are more stable
and $M g C O_{3}$ is least stable so it will decompose easily.

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