(C) The colour of transition metal ions is due to $d-d$ transitions,which require unpaired electrons in the $d$-orbitals.$Zn^{2+}$ has the electronic

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(C) The colour of transition metal ions is due to $d-d$ transitions,which require unpaired electrons in the $d$-orbitals.$Zn^{2+}$ has the electronic configuration $[Ar] 3d^{10}$,meaning all its $d$-orbitals are completely filled.Since there are no unpaired electrons,no $d-d$ transitions occur,making its aqueous solution colourless.