On heating which of the following releases CO₂ most easily?

26 2015 AIPMT-II The s-Block ElementsThermal stability of carbonates Easy
On heating which of the following releases $CO_2$ most easily?
A $MgCO_3$
B $CaCO_3$
C $K_2CO_3$
D $Na_2CO_3$

Detailed Solution

Thermal stability order: $K_2CO_3 > Na_2CO_3 > CaCO_3 > MgCO_3$
So $MgCO_3$, the least stable, releases $CO_2$ most easily: $MgCO_3 \xrightarrow{\Delta} MgO + CO_2$

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