Among $B e C O_{3}, C a C O_{3}, S r C O_{3}$ how many of these compounds are thermally more stable than $M g C O_{3}$ ?

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Solution

$B e C O_{3} < M g C O_{3} < C a C O_{3} < S r C O_{3}$

Thermal stability depends on the ionic character i.e., stronger the bond between the ions, more is the lattice energy of the ionic compound. Clearly, stronger the bond between the ions, more heat will be required to break the bond and as a result the thermal stability of the compound increases.

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M g C O_{3}

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

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