Which of the following compounds is coloured?

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(D) The colour in transition metal compounds is due to the presence of unpaired $d-$electrons,which allow for $d-d$ transitions.$Ti^{3+} = [Ar] \, 3d^

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All of these

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(D) The colour in transition metal compounds is due to the presence of unpaired $d-$electrons,which allow for $d-d$ transitions.$Ti^{3+} = [Ar] \, 3d^1$ (one unpaired electron).$Fe^{3+} = [Ar] \, 3d^5$ (five unpaired electrons).$Co^{2+} = [Ar] \, 3d^7$ (three unpaired electrons).Since all these ions contain unpaired $d-$electrons,all the given compounds are coloured.

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