Which of the following is coloured compound?

C u F_{2}

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C u I

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N a C l

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M g C l_{2}

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Solution

The correct option is A $C u F_{2}$
The d block elements having unpaired electrons form coloured compound in $C u F_{2}$ copper is $C u^{+ +}$ state.
$C u^{+ +} = 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}, 4 s^{0}, 3 d^{9}$ .
It has one unpaired electron. So, $C u F_{2}$ is coloured compound.

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