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# The thermal stability of $BaCO_3,CaCO_3$ and $MgCO_3$ is

$\begin{array}{1 1}(a)\;CaCO_3 > MgCO_3 > BaCO_3\\(b)\;MgCO_3 > CaCO_3 > BaCO_3\\(c)\;BaCO_3 > MgCO_3 > CaCO_3\\(d)\;BaCO_3 > CaCO_3 > MgCO_3\end{array}$

Thermal stability of carbonates down IIA increases.
Hence (d) is the correct answer.