Which ion is not coloured?

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Question

(D) The colour of transition metal ions is due to the presence of unpaired electrons,which allow for $d-d$ transitions.$Cr^{3+}$ has $3$ unpaired elec

Vedclass · Accepted Answer

$Cu^{+}$

Vedclass · Answer

(D) The colour of transition metal ions is due to the presence of unpaired electrons,which allow for $d-d$ transitions.$Cr^{3+}$ has $3$ unpaired electrons $([Ar] 3d^3)$.$Co^{2+}$ has $3$ unpaired electrons $([Ar] 3d^7)$.$Cr^{2+}$ has $4$ unpaired electrons $([Ar] 3d^4)$.$Cu^{+}$ has the electronic configuration $[Ar] 3d^{10}$,meaning it has no unpaired electrons.Therefore,$Cu^{+}$ is colourless.

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