Which of the following pairs of ions are colourless?

T i^{3 +}, C u^{2 +}

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S c^{3 +}, Z n^{2 +}

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C o^{2 +}, F e^{3 +}

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

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Solution

The correct option is D $S c^{3 +}, Z n^{2 +}$
$S c^{3 +}, Z n^{2 +}$ are colourless as they dont have any unpair electron in valence shell.
All remaining ions have unpair valence electron so they are colourfull.

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