The following compounds have been arranged in the order of increasing thermal stabilities. Identify the correct order.
$K_{2} {CO}_{3} (I), {MgCO}_{3} (II), {CaCO}_{3} (III), {BeCO}_{3} (IV)$

Question

The following compounds have been arranged in the order of increasing thermal stabilities. Identify the correct order. K 2 CO 3 I , MgCO 3 II , CaCO 3 III , BeCO 3 IV

TestHub · Accepted Answer

Carbonates of group 2 decompose to give oxides. Thermal stabilities of carbonates increase from Mg to Ba. Beryllium carbonate in unstable and is kept only in the atmosphere of $C O_{2}$ .
Group 1 carbonates (and also hydroxides) except lithium do not decompose on heating. In this problem, $K_{2} C O_{3}$ remains unchanged on heating.

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