Which pair of ions is colourless?

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Question

(C) Ions are colourless if they do not have any unpaired electrons in their $d$-orbitals (i.e.,$d^0$ or $d^{10}$ configuration).$1$. $Mn^{3+}$ $(3d^4)

Vedclass · Accepted Answer

$Zn^{2+}, Sc^{3+}$

Vedclass · Answer

(C) Ions are colourless if they do not have any unpaired electrons in their $d$-orbitals (i.e.,$d^0$ or $d^{10}$ configuration).$1$. $Mn^{3+}$ $(3d^4)$,$Co^{3+}$ $(3d^6)$: Both have unpaired electrons,so they are coloured.$2$. $Fe^{3+}$ $(3d^5)$,$Cr^{3+}$ $(3d^3)$: Both have unpaired electrons,so they are coloured.$3$. $Zn^{2+}$ $(3d^{10})$: It has a completely filled $d$-subshell with no unpaired electrons,so it is colourless.$4$. $Sc^{3+}$ $(3d^0)$: It has an empty $d$-subshell with no unpaired electrons,so it is colourless.$5$. $Ti^{2+}$ $(3d^2)$,$Cu^{2+}$ $(3d^9)$: Both have unpaired electrons,so they are coloured.Therefore,the pair $Zn^{2+}$ and $Sc^{3+}$ is colourless.

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