Lithium carbonate () decomposes at a much lower temperature compared to sodium carbonate (). What is the primary reason for this anomalous behavior of Lithium?

Question

Lithium carbonate ($Li_2CO_3$) decomposes at a much lower temperature compared to sodium carbonate ($Na_2CO_3$). What is the primary reason for this anomalous behavior of Lithium?

Prashant Kotian · Accepted Answer

Correct answer: B. Lithium is exceptionally small and has a very high polarizing power. It heavily polarizes the large anion, weakening the bond within the carbonate ion. This distortion facilitates its easy decomposition into a highly stable lattice and gas upon mild heating.

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