Which of the following is a coloured ion

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Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: D and F Block Elements

Question:

Which of the following is a coloured ion?

Options:

Cu⁺

Cd²⁺

Sc³⁺

Ti³⁺

Correct Answer:

Ti³⁺

Explanation:

Only Ti³⁺([Ar]3d¹) is coloured due to one unpaired electron in d-orbital making d-d transition possible, hence coloured.

Other ions have either fully filled d-orbital or empty d-orbital.