Which one of the following ionic species will impart colour to an aqueous solution?

^{+ 3}

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^{+ 2}

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^{+ 2}

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^{+ 3}

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Solution

The correct option is C Cr $^{+ 3}$
Among given ions only Cr $^{+ 3}$ ( $d^{3}$ configuration of Cr) has unpair electron so it will show colour. Cd $^{+ 2}$ , Zn $^{+ 2}$ and Sc $^{+ 3}$ have no valence free electron so they are colourless.

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