Compound that is both paramagnetic and coloured is:

Options

A. `K_2Cr_2O_7`
B. `(NH_4)_2 [TiCl_6]`
C. `V(SO_4)_2`
D. `K_3 [ Cu(CN)_4]`

Answer

C

Explanation

`K_2Cr_2O_7` contains `Cr^(6+) (3d^0)` ion which is diamagnetic and coloured due to charge transfer. `(NH_4)_2[TiCl_6]` contains `Ti^(4+) (3d^0)` which is diamagnetic and colourless . `VoSO_4` contains `V^(4+) (3d^1)` which is paramagnetic and coloured. `K_3[Cu(CN)_4]` contains `Cu^(2+) (3d^10)` which is diamagnetic and colourless'