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

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(A) Transition metal ions are colorless if they do not have unpaired electrons in their $d$-orbitals,meaning they have $d^{0}$ or $d^{10}$ configurati

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

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(A) Transition metal ions are colorless if they do not have unpaired electrons in their $d$-orbitals,meaning they have $d^{0}$ or $d^{10}$ configurations,as they cannot undergo $d-d$ transitions.$Sc^{3+}$: Atomic number $21$,configuration $[Ar] 3d^{0} 4s^{0}$ ($d^{0}$ configuration,colorless).$Zn^{2+}$: Atomic number $30$,configuration $[Ar] 3d^{10} 4s^{0}$ ($d^{10}$ configuration,colorless).Therefore,both $Sc^{3+}$ and $Zn^{2+}$ are colorless.

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

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