Correct order of stability of group IIA metal carbonates is :

M g C O_{3} > C a C O_{3} > S r C O_{3} > B a C O_{3}

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B a C O_{3} > S r C O_{3} > C a C O_{3} > M g C O_{3}

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S r C O_{3} > B a C O_{3} > C a C O_{3} > M g C O_{3}

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C a C O_{3} > M g C O_{3} > B a C O_{3} > S r C O_{3}

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Solution

The correct option is B $B a C O_{3} > S r C O_{3} > C a C O_{3} > M g C O_{3}$
As we go down the group, the carbonates have to be heated more strongly before they will decompose. It means the stability increases from $M g C O_{3}$ to $B a C O_{3}$ .

So the correct order of stability of carbonates of Group IIA is $B a C O_{3} > S r C O_{3} > C a C O_{3} > M g C O_{3}$ .

Hence option B is correct.

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