Which set has all the coloured ions?

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

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

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

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N a^{+}, M g^{2 +}, A l^{3 +}

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Solution

The correct option is B $C u^{2 +}, F e^{2 +}, C o^{2 +}$
$C u^{+}$ is colourless
$S c^{3 +}$ is colourless
$N a^{+}, M g^{3 +}, A l^{3 +}$ - colourless
as they have no electron unpaired in d-orbitals
But $C u^{2 +}, F e^{2 +}, C o^{2 +}$ are colourfull as they have unpaired electron.
$C u^{2 +}, F e^{2 +}, C o^{2 +}$
1 4 2 unpaired electron.

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