Which of the following ions is coloured?

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Question

(B) The colour of transition metal ions is due to the presence of unpaired electrons,which allow for $d-d$ transitions.$Cu^{+}$ $(3d^{10})$: No unpair

Vedclass · Accepted Answer

$Cu^{2+}$

Vedclass · Answer

(B) The colour of transition metal ions is due to the presence of unpaired electrons,which allow for $d-d$ transitions.$Cu^{+}$ $(3d^{10})$: No unpaired electrons,so it is colourless.$Cu^{2+}$ $(3d^9)$: Has $1$ unpaired electron,so it is coloured.$Ti^{4+}$ $(3d^0)$: No unpaired electrons,so it is colourless.$V^{5+}$ $(3d^0)$: No unpaired electrons,so it is colourless.Therefore,the correct option is $(B)$.

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