Thermal stability of carbonates of alkaline-earth metals follows the order

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${CaCO}_{3} > {BaCO}_{3} > {MgCO}_{3}$

${CaCO}_{3} > {MgCO}_{3} > {BaCO}_{3}$

${BaCO}_{3} > {CaCO}_{3} > {MgCO}_{3}$

${BaCO}_{3} > {MgCO}_{3} > {CaCO}_{3}$

answer is C.

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Detailed Solution

Thermal stability of carbonates increase on descending the Group 2. 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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