In which of the following pairs are both the ion colored in aqueous solution?

{S c}^{3 +}, {C o}^{2 +}

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{N i}^{2 +}, {C u}^{+}

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{N i}^{2 +}, {T i}^{3 +}

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{S c}^{3 +}, {T i}^{3 +}

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Solution

The correct option is C ${N i}^{2 +}, {T i}^{3 +}$
$S c^{3 +}$ and $C u^{+}$ are both colorless in aqueous solution. $N i^{2 +}$ forms light green solution and $T i^{3 +}$ forms violet solution.

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