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  1. Transition ions absorb light in :

    2. A.

     Infrared region
    B.

     Ultraviolet region
    C.

     Microwave region
    D.

     Visible region

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    Answer : Option D

    Explanation :

    Transition metal ions have an incomplete set of 3d electrons. Changes in the energy of these electrons correspond to the energy of visible light. The absorption of visible light by these ions lend colour to gems.

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