Q. 324.7( 12 Votes )

Which one of the A. MgCO3

B. CaCO3

C. SrCO3


Answer :

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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