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Among the following, the coloured compound is
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$\mathrm{CuF}_2$
$\mathrm{CuF}_2$
In $\mathrm{CuF}_2, \mathrm{Cu}^{2+}$ ions exist, having $d^9$-configuration. Unpaired electron causes colour ( $d-d$ transition)
In the crystalline form, $\mathrm{CuF}_2$ is blue coloured
In the crystalline form, $\mathrm{CuF}_2$ is blue coloured
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