Which of the following pairs of ions are colo | vedclass

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(D) Ions are colored in aqueous solution if they have unpaired electrons in their $d$-orbitals (i.e.,$d^1$ to $d^9$ configuration).$Sc^{3+}$ $(3d^0)$

Vedclass · Accepted Answer

$Ni^{2+}, Ti^{3+}$

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(D) Ions are colored in aqueous solution if they have unpaired electrons in their $d$-orbitals (i.e.,$d^1$ to $d^9$ configuration).$Sc^{3+}$ $(3d^0)$ has no unpaired electrons,so it is colorless.$Ti^{4+}$ $(3d^0)$ has no unpaired electrons,so it is colorless.$Co^{2+}$ $(3d^7)$ has $3$ unpaired electrons,so it is colored.$Ni^{2+}$ $(3d^8)$ has $2$ unpaired electrons,so it is colored.$Cu^{+}$ $(3d^{10})$ has no unpaired electrons,so it is colorless.$Ti^{3+}$ $(3d^1)$ has $1$ unpaired electron,so it is colored.Comparing the options,both $Ni^{2+}$ and $Ti^{3+}$ have unpaired electrons,making them colored in aqueous solution.

Which of the following pairs of ions are colored in their aqueous solution?

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