Which of the following pairs of ions are colo | vedclass

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Question

(B) The colour of transition metal ions is due to the $d-d$ transition of electrons,which requires the presence of unpaired electrons in the $d$-orbit

Vedclass · Accepted Answer

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

Vedclass · Answer

(B) The colour of transition metal ions is due to the $d-d$ transition of electrons,which requires the presence of unpaired electrons in the $d$-orbitals.For $Sc^{3+}$: The electronic configuration is $[Ar] 3d^0$. It has no unpaired electrons.For $Zn^{2+}$: The electronic configuration is $[Ar] 3d^{10}$. It has no unpaired electrons.Since both $Sc^{3+}$ and $Zn^{2+}$ have no unpaired electrons,they are colourless.

Which of the following pairs of ions are colourless?

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