Q. 324.7( 12 Votes )
Which one of the A. MgCO3
⇒ The thermal stability increases with increase in the electropositive character of the metal or the size of the cation present in the carbonate increases.
⇒ The increasing order of the size of cations of the given carbonates:
Mg < Ca < Sr < Ba
Hence, the increasing order of the thermal stability is:
MgCO3 < CaCO3 < SrCO3 < BaCO3
⇒ Thus, among alkaline earth metal carbonates, option (D), BaCO3 is thermally the most stable.
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