A) \[BeC{{O}_{3}}<MgC{{O}_{3}}<{{K}_{2}}C{{O}_{3}}<CaC{{O}_{3}}\]
B) \[BeC{{O}_{3}}<MgC{{O}_{3}}<CaC{{O}_{3}}<{{K}_{2}}C{{O}_{3}}\]
C) \[MgC{{O}_{3}}<BeC{{O}_{3}}<CaC{{O}_{3}}<{{K}_{2}}C{{O}_{3}}\]
D) \[{{K}_{2}}C{{O}_{3}}<MgC{{O}_{3}}<CaC{{O}_{3}}<BeC{{O}_{3}}\]
Correct Answer: B
Solution :
Thermal stability of carbonates increases in a group as we move from top to bottom and decreases in a period as we move from left to right. So, the correct order of thermal stability of given carbonates is: \[BeC{{O}_{3}}<MgC{{O}_{3}}<CaC{{O}_{3}}<{{K}_{2}}C{{O}_{3}}\] Be, Mg and Ca present in second group and K present in first group.
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