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Question
Which one of the alkaline earth metal carbonates is thermally the most stable?
Options
MgCO3
CaCO3
SrCO3
BaCO3
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Solution
BaCO3
Explanation:
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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