Generally transition elements and their salts are coloured due to the presence of unpaired electrons in metal ions. Which of the following compounds are coloured?
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It is due to charge transfer. In $\ce{MnO_4^-}$ an electron is momentarily transferred from $O$ to the metal, thus momentarily $O^{2-}$ is changed to $O-$ and reducing the oxidation state of the metal from $\ce{Mn (VII)}$ to $\text{Mn (VI)}.$
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