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Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________?
A. Smaller electronegativity of alkali metals
B. Smaller ionic radius of these metals
C. De-excitation of electrons from higher energy levels to low energy levelCorrect Answer
D. Excitation of electrons from low energy levels to higher energy levels
Correct Option: C. De-excitation of electrons from higher energy levels to low energy level
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