Which of the following carbonates of alkali m | vedclass

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(A) The thermal stability of alkali metal carbonates increases as we move down the group from $Li$ to $Cs$. This is because the electropositive charac

Vedclass · Accepted Answer

$Li_2CO_3$

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(A) The thermal stability of alkali metal carbonates increases as we move down the group from $Li$ to $Cs$. This is because the electropositive character of the alkali metal increases down the group,which makes the $M-O$ bond stronger and the carbonate ion more stable. $Li_2CO_3$ is the least stable among them because $Li^+$ has a very small size and high polarizing power,which polarizes the carbonate ion $(CO_3^{2-})$ and leads to its decomposition into $Li_2O$ and $CO_2$ at relatively low temperatures. Therefore,$Li_2CO_3$ has the least thermal stability.

Which of the following carbonates of alkali metals has the least thermal stability?

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