The correct order of thermal decomposition temperatures of the alkaline earth metal carbonates is:

B e C O_{3} > 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} > B e C O_{3}

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

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

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Solution

The correct option is B $B a C O_{3} > S r C O_{3} > C a C O_{3} > M g C O_{3} > B e C O_{3}$
Thermal decomposition temperature is the temperature at which the compound decomposes.

The thermal stability of the carbonates depends on the polarising power of the cation. Greater the polarising power lesser the thermal stability.
As we move down the alkaline earth metal group, the size of the cation increases and hence the polarising power decreases. The stability of the carbonates also increases. Greater the thermal stability, greater the thermal decomposition temperature.

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