In which of the following pairs, both ions are coloured in aqueous medium?

S c^{+ 3}

and

Z n^{+ 2}

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C u^{+ 2}

and

T i^{+ 4}

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T i^{+ 3}

and

C o^{+ 2}

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C d^{+ 2}

and

M n^{+ 2}

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Solution

The correct option is C $T i^{+ 3}$ and $C o^{+ 2}$
Both $T i^{+ 3}$ and $C o^{+ 2}$ ions are coloured. $T i^{+ 3}$ is violet coloured in aqueous solution and $C o^{+ 2}$ is pink coloured in aqueous solution.

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S c = 21, T i = 22, N i = 28, C u = 29, C o = 27

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