Which of the following system is coloured in lanthanoid ions?

f^{7}

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f^{0}

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f^{6}

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f^{14}

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Solution

The correct options are
A $f^{7}$
C $f^{6}$

(Refer to Image)
Due to the presence of unpaired $e^{-}$ $f^{7}$ and $f^{6}$ system show color as they can easily undergo $d - d$ transition.

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