Question

54. Correct increasing order for the wavelengths of
absorption in the visible region the complexes of
CO3+ is :-
(1) [Co(H2O)6]3+, (Colen)3]3+, (CO(NH3)]3+
(2) (Co(H2O)6]3+, [Co(NH3)6]3+, (Colen)313+
(3) (CO(NH3)6]3+, (Colen)3]3+, [Co(H20)6]3+
f45 (Colen)3]3+, [Co(NH3)6]3+, [CO(H20)6]3+
AIMS 2017

Answer 1

Answer:

Option 4

Step-by-step explanation:

Co ordination compounds having strong field ligand have high energy and as

E = hc/wavelength

hence strong field ligands have lower wavelength

Now looking at spectrochemical series

en>NH3>H2O

hence en is strongest among the three and H2O is weakest

So wavelength order is

[Co(en)3]3+< [Co(NH3)6]3+ < [Co(H2O)6]3+

Hope i was able to answer your doubt