(A) The thermal stability of alkaline earth metal carbonates increases as the size of the cation increases down the group.As the size of the cation in

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(A) The thermal stability of alkaline earth metal carbonates increases as the size of the cation increases down the group.As the size of the cation increases,the polarizing power of the cation decreases,making the $CO_3^{2-}$ ion more stable.The ionic radii order is $Mg^{2+} Therefore,the thermal stability order is $MgCO_3 Z > X$.