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Among the following carbonates, which one is the least thermally stable?

1. Li2CO3
2. Na2CO3
3. K2CO3
4. Rb2CO3

Correct answer: Li2CO3

Solution

Lithium carbonate (Li2CO3) is the least thermally stable due to the small size of lithium ions, which leads to stronger lattice energy and makes it more susceptible to decomposition at lower temperatures compared to the other alkali metal carbonates.

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