Pick out the colourless ion of transition metal from the following.

Z n^{2 +}

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C u^{2 +}

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F e^{3 +}

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M n^{2 +}

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Solution

The correct option is D $Z n^{2 +}$
$Z n^{2 +}$ is colourless ion of transition metal series as it has all paired electrons. The valence shell electronic configuration of $Z n^{2 +}$ ion is $3 d^{10}$ .
Note: Colour is observed due to the presence of unpaired electrons.

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