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NCERT Class XI Chemistry The s-Block Elements Solutions

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Question : 32 of 32
Marks: +1, -0
Which one of the alkaline earth metal carbonates is thermally the most stable ?
(a) MgCO3MgCO_3
(b) CaCO3CaCO_3
(c) SrCO3SrCO_3
(d) BaCO3BaCO_3
Solution:  
(d) : BaCO3BaCO_3 → Most thermally stable carbonate.
CO32–CO^{2–}_3 being a bigger anion stabilises a bigger cation more efficiently. Thus, Ba2+Ba^{2+} being bigger in size is the most stable.
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