The thermal stability of MCO_3 (where M is an | vedclass

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Question

(A) The thermal stability of alkaline earth metal carbonates $(MCO_3)$ increases as we move down the group from $Be$ to $Ba$. This is because the elec

Vedclass · Accepted Answer

$BeCO_3 < MgCO_3 < CaCO_3 < SrCO_3 < BaCO_3$

Vedclass · Answer

(A) The thermal stability of alkaline earth metal carbonates $(MCO_3)$ increases as we move down the group from $Be$ to $Ba$. This is because the electropositive character of the metal increases down the group,which increases the ionic character of the $M-O$ bond. As the size of the cation increases,the polarizing power of the cation decreases,leading to greater stability of the carbonate ion $(CO_3^{2-})$. Therefore,the order of thermal stability is $BeCO_3 < MgCO_3 < CaCO_3 < SrCO_3 < BaCO_3$.

The thermal stability of $MCO_3$ (where $M$ is an alkaline earth metal) follows the order:

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