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

T i^{4 +}

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C u^{+}

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Z n^{2 +}

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C r^{3 +}

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Solution

The correct option is D $C r^{3 +}$
Among all given ionic species only $C r^{3 +} d^{3}$ have unpaired electron so it will show color due to d-d transition.

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