Question 10.32 Which one of the alkaline earth metal carbonates is thermally the...

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Question 10.32 Which one of the alkaline earth metal carbonates is thermally the most stable?

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

Class XI The s-Block Elements Page 306

Aasthakatheriya1 (D) is correct.As the electropositive character of the metal increases or basicity of their hydroxide increases on moving down the group, there thermal stability increases.
e.g., order of thermal stability is BeCO3 < MgCO3 < CaCO3 < SrCO3 < BaCO3
thus, BaCO3 is the most stable

abhi178

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Hello..
Baco3 is more thermally stable because polarising power of Ba2+ is less than other alkaline earth metals and thermal stability is inversely proportional to polarising power of action when compound containing polyatomic anion and here carbonate is polyatomic anion.
I hope it help you ☺️

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