JEE Advance - Chemistry (2008 - Paper 2 Offline - No. 5)
Among the following, the coloured compound is :
CuCl
K$$_3$$[Cu(CN)$$_4$$]
CuF$$_2$$
[Cu(CH$$_3$$CH)$$_4$$]BF$$_4$$
Explanation
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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