The aqueous solution containing which one of the following ions will be colourless

The aqueous solution containing which one of the following ions will be colourless
  1. $\mathrm{Sc}^{3+}$
  2. $\mathrm{Fe}^{2+}$
  3. $\mathrm{Ti}^{3+}$
  4. $\mathrm{Mn}^{2+}$

Solution

$\begin{aligned}{ }_{21} \mathrm{Sc} & ightarrow \operatorname{1s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 4 \mathrm{s}^{2} 3 \mathrm{d}^{1} \\ \mathrm{Sc}^{+3} & ightarrow 1 \mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} \end{aligned}$
Due to the absence of unpaired electrons it will be colourless.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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