The correct sequence of thermal stability of the following 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} < S r C O_{3} < C a C O_{3} < M g C O_{3}

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M g C O_{3} < S r C O_{3} < C a 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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Which one of the alkaline earth metal carbonates is thermally the most stable?

(a) MgCO₃ (b) CaCO₃ (c) SrCO₃ (d) BaCO₃

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