Fe CN 6 4 - Fe CN 6 3 - Ti CN 6 3 - Ni CN 4 2 - Co CN 6 3 - Among the given complexes, number of paramagnetic complexes is

Step-by-step solution

Complexes in which central atom has unpaired electrons is said to be paramagnetic in nature and where unpaired electrons are not present are diamagnetic in nature. Fe CN 6 3 -   , Fe + 3 3 d 5   →   t 2 g 2 , 2     e g 1 , paramagnetic (one unpaired electron) Fe CN 6 4 - ,    Fe + 2   3 d 6 → t 2 g 6 e g 0 ,diamagnetic Ti CN 6 3 - ,     Ti + 3 ( 3 d 1 ) → t 2 g 1 , Paramagnetic ( 1 unpaired electron) Ni CN 4 2 - ,   Ni + 2 ( 3 d 8 ) → Di