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  4. Among the carbonates of alkali metals which one has highest thermal stability?

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Q. Among the carbonates of alkali metals which one has highest thermal stability?

NTA AbhyasNTA Abhyas 2020The s-Block Elements

Solution:

On moving down the group thermal stability of alkali metal carbonate increases so $Cs_{2}CO_{3}$ is most stable here.

$Cs_{2}CO_{3}>Rb_{2}CO_{3}>K_{2}CO_{3}>Na_{2}CO_{3}$