Carbonate of which of the following element will give stable oxide on heating?

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Solution

The correct option is A Li
As we down the group the stability of carbonates of alkali metals increases( $L i_{2} C O_{3}$ ) is less stable than the latter, due to the large difference in sizes of the $L i^{+}$ and carbonate ions). So lithium carbonate forms more stable oxide.

$L i_{2} C O_{3} (s) \to L i_{2} O (s) + C O_{2} (g)$ .

Hence, the correct option is $A$

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