Which one of the following forms a colorless solution in aqueous medium?

{C r}^{3 +}

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{T i}^{3 +}

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{S c}^{3 +}

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V^{3 +}

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Solution

The correct option is B ${S c}^{3 +}$
$C r^{3 +}$ = $3 d^{3}$ = coloured

$T i^{3 +}$ = $3 d^{1}$ = coloured

$V^{3 +}$ = $3 d^{2}$ = coloured

$S c^{3 +}$ has electron configuration of [Ar] $4 s^{0} 3 d^{0}$ . Therefore without any unpaired electrons it forms a colorless solution in aqueous medium.

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