(A) Alkali metal carbonates (except $Li_2CO_3$) are thermally stable and do not decompose upon heating.$MgCO_3$ is an alkaline earth metal carbonate,w

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(A) Alkali metal carbonates (except $Li_2CO_3$) are thermally stable and do not decompose upon heating.$MgCO_3$ is an alkaline earth metal carbonate,which decomposes on heating to form $MgO$ and $CO_2$ according to the reaction: $MgCO_3 \xrightarrow{\Delta} MgO + CO_2$.