A) \[BaC{{O}_{3}}<CaC{{O}_{3}}<SrC{{O}_{3}}<MgC{{O}_{3}}\]
B) \[MgC{{O}_{3}}<CaC{{O}_{3}}<SrC{{O}_{3}}<BaC{{O}_{3}}\]
C) \[BaC{{O}_{3}}<SrC{{O}_{3}}<CaC{{O}_{3}}<MgC{{O}_{3}}\]
D) \[MgC{{O}_{3}}<SrC{{O}_{3}}<CaC{{O}_{3}}<BaC{{O}_{3}}\]
Correct Answer: B
Solution :
Thermal stability of Alkaline earth metals carbonates increases down the group. because down the group polarizing power of cation decreases. So thermal stability increases. Hence, Thermal stability order : \[MgC{{O}_{3}}<CaC{{O}_{3}}<SrC{{O}_{3}}<BaC{{O}_{3}}\]
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