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Why can't the Fajans' rule and "Lattice energy" theory be used to explain the difference in thermal stability of MgCO3 and CaCO3?

(1) Thermal Stability: $\ce{CaCO3(s) ->[\Delta] CaO(s) + CO2(g)}$ $\ce{MgCO3(s) ->[\Delta] MgO(s) + CO2(g)}$ Because of smaller $\ce{Mg^2+}$ ion, it will polarise the $\ce{CO3^2-}$ ion more than ...
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