Which ofthe following complexions is expected to absorb visible light?

Options

A. `[Ti(en)_2 (NH_3)_2]^(4+)`
B. `[Cr(NH_3)_6]^(3+)`
C. `[Zn(NH_3)_6]^(2+)`
D. `[Sc(H_2O)_3 (NH_3)_3]^(3+)`

Answer

B

Explanation

`d^(0) (Ti^(4+) , Sc^(3+))` and `d^(10) (Zn^(2+))`species will not absorb visible light and are colourless, paramagnetic and hence whereas `d^3 (Cr^(3+))` can undergo d-d transition or absorption of visible light of a particular wavelength and will be coloured.