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Question

Among the carbonates of alkali metals which one has highest stability :

A
Cs2CO3
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B
Rb2CO3
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C
K2CO3
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D
Na2CO3
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Solution

The correct option is B Cs2CO3
As we go down the group the stability of metal carbonates increases. The larger compounds further down require more heat than the lighter compounds in order to decompose. So Cs2CO3 has the highest thermal stability than the other given carbonates.
Hence option A is correct.

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