Correct Answer: Option D

Explanation

Sodium carbonate (Na\(_2\)CO\(_3\)) is an alkali metal carbonate that is extremely stable and does not decompose when heated strongly, even at Bunsen burner temperatures. This stability is due to the large size and low charge density of the sodium cation (Na\(^+\)), which has low polarizing power and cannot easily distort the carbonate ion (CO\(_3\)\(^{2-}\)) to break its carbon-oxygen bonds. Most group 1 carbonates (except lithium carbonate) exhibit this high thermal stability.

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