KCET2023ChemistryCoordination Compounds
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 ( H ₂ O )₆ ]²⁺ aq solution, following co-ordination entities are formed. I. [ Ni ( H ₂ O )₄ en ]²⁺(a q)- pale blue II. [ Ni ( H ₂ O )₂( en )₂ ]²⁺(a q)- blue/purple III. [ Ni ( en )₃ ]²⁺( aq ) - violet The wavelength in nm of light absorbed in case of I and III are respectively
Options
- A475 ~nm and 310 ~nm
- B300 ~nm and 475 ~nm
- C310 ~nm and 500 ~nm
- D600 ~nm and 535 ~nm
Correct answer
D. 600 ~nm and 535 ~nm
Step-by-step solution
Given that, compound I shows pale blue colour. It means that, absorbed colour is orange whereas compound III shows violet colour then the absorbed colour is yellow. The wavelength of light absorbed by I and III are nearly 600 ~nm and 535 ~nm respectively.