Chemistry - s Block Elements Question with Solution | TestHub

The thermal stability of carbonates increases down the group. So, the order of thermal stability of carbonates of alkaline earth metals is $${\mathrm{BaCO}}_3>{\mathrm{CaCO}}_3>{\mathrm{MgCO}}_3>{\mathrm{BeCO}}_3.$$ Therefore, ${\mathrm{BaCO}}_3$ is thermodynamically most stable and ${\mathrm{BeCO}}_3$ is least stable.