Which of the following can not decompose on heating to give $\ce{CO_2}$?
- $\ce{Li_2CO_3}$
- $\ce{Na_2CO_3}$
- $\ce{KHCO_3}$
- $\ce{BaCO_3}$
What I have read till now: Lithium carbonate is not so stable to heat and bicarbonates of alkali metals decompose at approximately $\pu{300 ^\circ C}$. The stability of alkaline earth metals increases down the group and they decompose on red heating.
This only leaves us with one option as correct (2nd), but what is the reaction of decomposition of $\ce{Na_2CO_3}$?