The correct order of thermal stability of alkaline earth metals carbonates is:

B a C O_{3} < C a C O_{3} < S r C O_{3} < M g 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} < C a C O_{3} < S r C O_{3} < M g 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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Solution

The correct option is B $M g C O_{3} < C a C O_{3} < S r C O_{3} < B a C O_{3}$
The thermal stability of alkaline earth metals carbonates increases down the group because down the group polarizing power of cation decreases. So thermal stability increases.
Hence, thermal stability order : $M g C O_{3} < C a C O_{3} < S r C O_{3} < B a C O_{3}$

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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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