QJEEAdv08Ch5a36: JEE Advanced 2008 Chemistry - Class 12 JEEAdv08Ch5a36 Solution: Among the following, the coloured compound is :

Question

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Among the following, the coloured compound is :

Accepted Answer

The electronic configuration of Cu $^{2 +}$ is [Ar]3d $^{9}$ . It contains one unpaired electron. Hence, CuF $_{2}$ is coloured compound.

In all other compounds, Cu $^{+}$ ion is present. It has electronic configuration of Cu $^{2 +}$ is [Ar]3d $^{10}$ . All electrons are paired.

Hence, they are colourless.

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