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?

(a) KMnO4

(b) Ce(SO4)2  

(c) TiCl4

(d) Cu2Cl2

Choose the correct option

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

KMnO4 is coloured due to the charge Warister and not because of ie presence of unpaired electrons. Similarly, oxidation state of Ce in Ce(SO4)2 is +4 with 4f° electronic configuration, It is also coloured (yellow) due to charge transfer and not due to f - f transition.