Which of the following represents the electronic configuration of a coloured ion?

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}

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All of the above

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Solution

The correct option is B $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}$
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}$ represents the electronic configuration of a coloured ion because of the empty d-orbital. Due to d-d transition it is coloured.

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