The thermal stability of alkaline earth metal carbonates- $M g C O_{3}, C a C O_{3}, S r C O_{3}$ and $B a C O_{3}$ , follows the order:

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

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

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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} > M g C O_{3} > C a C O_{3}

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Solution

The correct option is A $B a C O_{3} > S r C O_{3} > C a C O_{3} > M g C O_{3}$
As we move down the group alkaline earth metal carbonates require more heating to decompose, so carbonates become more thermally stable down the group.

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Which one of the alkaline earth metal carbonates is thermally the most stable?

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