MCQ Solution: S – Block Elements
The metal carbonate that is thermally least stable is
1) BeCO3
2) BaCO3
3) CaCO3
4) MgCO3
SOLUTION
(i) More be the ionic nature, more be the attractive force between the species.
(ii) More be the attractive force, more be the thermal stability.
(iii) Ionic character for the same anionic species, increases down the group.
Thus, correct order of the thermal-stability is BaCO3>CaCO3>MgCO3>BeCO3
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