The following compounds have been arranged in the order of their increasing thermal stabilities....

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The following compounds have been arranged in the order of their increasing thermal stabilities. Identify the correct order.
\( \mathrm{K}_{2} \mathrm{CO}_{3} \) (I), \( \mathrm{MgCO}_{3} \) (II), \( \mathrm{CaCO}_{3} \) (III), \( \mathrm{BeCO}_{3} \) (IV)
(a) I \( \) II \( \) III \( \) IV
(b) IV \( \) II \( \) III \( \) I
(c) IV \( \) II \( \) I \( \) III
(d) II \( \) IV \( \) III \( \) I
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