Generally transition elements and their salts are coloured due to t...

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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?
P
(i) \( \mathrm{KMnO}_{4} \)
(ii) \( \mathrm{Ce}\left(\mathrm{SO}_{4}\right)_{2} \)
\( \mathrm{W} \)
(iii) \( \mathrm{TiCl}_{4} \)
(iv) \( \mathrm{Cu}_{2} \mathrm{Cl}_{2} \)
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