Which of the following carbonates of a metal | vedclass

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(A) Lithium carbonate $Li_{2}CO_{3}$ is the least thermally stable among the given alkali metal carbonates.The thermal stability of alkali metal carbo

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$Li_{2}CO_{3}$

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(A) Lithium carbonate $Li_{2}CO_{3}$ is the least thermally stable among the given alkali metal carbonates.The thermal stability of alkali metal carbonates increases as we move down the group from $Li$ to $Cs$ because the ionic character increases and the polarizing power of the metal cation decreases.Due to the very small size of the $Li^{+}$ ion,it has a high polarizing power. It distorts the electron cloud of the large carbonate ion $(CO_{3}^{2-})$,which weakens the $C-O$ bond and strengthens the $Li-O$ bond,facilitating the decomposition into oxide and carbon dioxide.The decomposition reaction is: $Li_{2}CO_{3} \xrightarrow{\Delta} Li_{2}O + CO_{2}$

Which of the following carbonates of a metal has least thermal stability?

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