The most stable carbonate is

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(D) As we move down the group,the size of the metal cation increases,which leads to a decrease in the polarising power of the cation.According to Faja

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$BaCO_3$

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(D) As we move down the group,the size of the metal cation increases,which leads to a decrease in the polarising power of the cation.According to Fajan's rule,a decrease in polarisation leads to an increase in the thermal stability of the carbonate.Among the given options,$Ba^{2+}$ is the largest cation,making $BaCO_3$ the most thermally stable carbonate.Hence,the correct option is $D$.

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