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Question

(A) Among alkali metal carbonates,only $Li_2CO_3$ decomposes on heating because of the small size of the $Li^+$ ion,which polarizes the carbonate ion

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$Li_2CO_3$

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(A) Among alkali metal carbonates,only $Li_2CO_3$ decomposes on heating because of the small size of the $Li^+$ ion,which polarizes the carbonate ion effectively.The reaction is: $Li_2CO_3 \xrightarrow{\Delta} Li_2O + CO_2 \uparrow$Other alkali metal carbonates like $Na_2CO_3$ are thermally stable and do not decompose under ordinary heating conditions.

Which alkali metal carbonate decomposes on heating to liberate $CO_2$ gas?

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