1.

Which pair among the following is colourless?(a) Sc3+, Zn2+(b) Ti2, Cu2+(c) Fe3+, Mn2+(d) Fe3+, Cu2+

Answer»

Correct option is  (a) Sc3+, Zn2+

Sc3+ - [Ar]

Zn2+- 3d10

Both of them have completely filled orbitals.

Therefore, both are colourless



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