Explain, why Ce3+ ion is colourless. – InterviewSolution

1.

Explain, why Ce3+ ion is colourless.

Answer»

The electronic configuration of Ce³⁺ is, [Xe] 4f⁷
Even though there is one unpaired electron in 4f sub-shell, the f → f transition involves very low energy. Hence, Ce³⁺ ion does not absorb radiation in the visible region.

Therefore Ce³⁺ ion is colourless.

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