Which of the following is a colourless ion?

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(D) The colour of an ion is due to the presence of unpaired electrons which allow $d-d$ transitions.Electronic configuration of $Zn$ $(Z=30)$ is $[Ar]

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$Zn^{2+}$

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(D) The colour of an ion is due to the presence of unpaired electrons which allow $d-d$ transitions.Electronic configuration of $Zn$ $(Z=30)$ is $[Ar] 3d^{10} 4s^2$.Electronic configuration of $Zn^{2+}$ is $[Ar] 3d^{10}$.Since all $d$-orbitals are completely filled in $Zn^{2+}$,there are no unpaired electrons.Therefore,$Zn^{2+}$ is a colourless ion.

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