In the following pairs,the one in which both | vedclass

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(A) Transition metal ions are colourless if they do not have unpaired electrons to undergo $d-d$ transitions. This occurs in ions with $d^{0}$ or $d^{

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

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(A) Transition metal ions are colourless if they do not have unpaired electrons to undergo $d-d$ transitions. This occurs in ions with $d^{0}$ or $d^{10}$ electronic configurations.$A$) $Sc^{3+}$ $(3d^{0})$ and $Zn^{2+}$ $(3d^{10})$: Both have no unpaired electrons,so they are colourless.$B$) $Ti^{4+}$ $(3d^{0})$ is colourless,but $Cu^{2+}$ $(3d^{9})$ has one unpaired electron and is coloured.$C$) $V^{2+}$ $(3d^{3})$ and $Ti^{3+}$ $(3d^{1})$: Both have unpaired electrons and are coloured.$D$) $Zn^{2+}$ $(3d^{10})$ is colourless,but $Mn^{2+}$ $(3d^{5})$ has five unpaired electrons and is coloured.Therefore,the correct pair is $Sc^{3+}, Zn^{2+}$.

In the following pairs,the one in which both transition metal ions are colourless is

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