Which one of the following alkaline earth metal carbonates is thermally the most stable?
Correct answer: A. BaCO3
- A. BaCO3
- B. MgCO3
- C. CaCO3
- D. SrCO3
Explanation
'Barium carbonate' is thermally the most stable. As we move down the group, the charge density of the cation decreases due to increasing cationic radius. As a result, the polarisation of the anion decreases, or the polarising ability of the cation decreases down the group. The lesser the polarisation, the greater the stability of a compound. Hence as we move down the group thermal stability of the carbonates increases. Barium is the lowest down in the group hence its carbonate has the greatest thermal stability.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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