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  4. Which of the following compounds has colour but no unpaired electrons?

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Q. Which of the following compounds has colour but no unpaired electrons?

The d-and f-Block Elements

Solution:

In $KMnO _{4}, Mn$ is in $+7$ oxidation state.

$Mn ^{7+}(Z=25) \longrightarrow [ Ar ]^{18} 3 d^{0} 4 s^{0}$

It has no unpaired electron but still $KMnO _{4}$ is dark pink in colour due to charge transfer spectra.