(A) The colour of transition metal ions is due to the presence of unpaired electrons which allow $d-d$ transitions.$Cu^{+}$ has the electronic configu

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(A) The colour of transition metal ions is due to the presence of unpaired electrons which allow $d-d$ transitions.$Cu^{+}$ has the electronic configuration $[Ar] 3d^{10}$.Since all $10$ electrons are paired,there are no unpaired electrons available for $d-d$ transitions.Therefore,$Cu^{+}$ is colourless.