KCET 2023 Chemistry Solved Paper

If a didentate ligand ethane −1,2 - diamine is progressively added in the molar ratio en : Ni::1:1,2:1,3:1 to [Ni(H2O)6]2+ aq solution, following co-ordination entities are formed.
I. [Ni(H2O)4‌en](aq)2+-pale blue
II. [Ni(H2O)2(en)2](‌aq ‌)2+-blue/purple
III. [Ni(en)3](‌aq ‌)2+-violet
The wavelength in nm of light absorbed in case of I and III are rsepctively