Which of the following is least thermally sta | vedclass

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(D) The thermal stability of alkaline earth metal carbonates increases down the group as the electropositive character of the metal increases. The ord

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$BeCO_3$

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(D) The thermal stability of alkaline earth metal carbonates increases down the group as the electropositive character of the metal increases. The order of thermal stability is: $BeCO_3 $BeCO_3$ is the least thermally stable because the small size of the $Be^{2+}$ ion leads to high polarization of the carbonate ion, making it unstable. It is so unstable that it must be stored in an atmosphere of $CO_2$ to prevent decomposition: $BeCO_3 \rightarrow BeO + CO_2$.

Which of the following is least thermally stable?

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