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Question
The colour of transition metal ions is due to ______ transitions.
Fill in the Blanks
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Solution
The colour of transition metal ions is due to d-d transitions.
Explanation:
Transition metal ions have partially filled d-orbitals. When light falls on them, electrons get excited from one d-orbital to another; this is called a d-d transition. The energy absorbed during this transition corresponds to certain wavelengths of visible light, and the rest is reflected, giving the ion its characteristic colour.
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