SELECT * FROM question_mgmt as q WHERE id=3204 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=51 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Which one of the alkaline earth metal carbonates is thermally the most stable?

(a) MgCO3 (b) CaCO3 (c) SrCO3 (d) BaCO3

Answer:

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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