Thermal stability of MCO_3 is in order: | vedclass

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Question

(A) The thermal stability of alkaline earth metal carbonates $(MCO_3)$ increases as the size of the metal cation $(M^{2+})$ increases down the group.T

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 the size of the metal cation $(M^{2+})$ increases down the group.This is because the larger cation polarizes the large carbonate ion $(CO_3^{2-})$ less effectively,making the $M-O$ bond stronger and the carbonate ion more stable.The order of ionic radii is $Be^{2+} Therefore,the thermal stability order is $BeCO_3 < MgCO_3 < CaCO_3 < SrCO_3 < BaCO_3$.

Thermal stability of $MCO_3$ is in order:

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