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Question: Answered & Verified by Expert
Thermal stability of BaCO3,  CaCO3 and MgCO3 is
Chemistrys Block ElementsNEET
Options:
  • A BaCO3>CaCO3>MgCO3
  • B BaCO3>MgCO3>CaCO3
  • C CaCO3>MgCO3>BaCO3
  • D MgCO3>CaCO3>BaCO3
Solution:
1135 Upvotes Verified Answer
The correct answer is: BaCO3>CaCO3>MgCO3
(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 for thermal-stability is

BaCO3>CaCO3>MgCO3

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