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(a) MgCO3 (b) CaCO3 (c) SrCO3 (d) BaCO3
Asked by Rahul Last Modified
Answer 
From the given options the most thermally stable alkaline earth metal carbonate among Magnesium Carbonate, Calcium Carbonate, Strontium Carbonate, Barium Carbonate is Magnesium Carbonate.
This is because it has the “smallest atomic number” due to which the size of the molecules or atom is the smallest and most stable. Other options are not as stable as it is because they have a higher atomic number, bigger atomic size and thus the outer electrons are comparatively loosely bound and less “thermally stable”.
Harshit Bhardwaj
Thermal stability increases with the increase in the size of the cation present in the carbonate. The increasing order of the cationic size of the given alkaline earth metals is
Mg < Ca < Sr < Ba
Hence, the increasing order of the thermal stability of the given alkaline earth metal carbonates is
MgCO3 < CaCO3 < SrCO3 < BaCO3
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