The correct order of increasing thermal stability of $K_{2} C O_{3}, M g C O_{3}, C a C O_{3} and B e C O_{3}$ is

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$B e C O_{3} < M g C O_{3} < C a C O_{3} < K_{2} C O_{3}$

$B e C O_{3} < M g C O_{3} < K_{2} C O_{3} < C a C O_{3}$

$K_{2} C O_{3} < M g C O_{3} < C a C O_{3} < B e C O_{3}$

$M g C O_{3} < B e C O_{3} < C a C O_{3} < K_{2} C O_{3}$

answer is A.

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Detailed Solution

As the basicity of metal hydroxides increases down the group from Be to Ba, the thermal stability of their carbonates also increases in the same order. Further group 1 compounds are more thermally stable than group 2 because their hydroxide are much basic than group 2 hydroxides therefore, the order of thermal stability is $B e C O_{3} < M g C O_{3} < C a C O_{3} < K_{2} C O_{3}$