NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice
Most common oxidation states shown by cerium are
Options
- A+ 2 , + 4
- B+ 3 , + 4
- C+ 3 , + 5
- D+ 2 , + 3
Correct answer
B. + 3 , + 4
Step-by-step solution
The electronic configuration of Ce is: C e : X e 4 f 1 5 d 1 6 s 2 The most common oxidation states shown by cerium are +3 and +4 . As energy difference between 4f and 5d-orbitals is very less, so electrons of f-orbitals also take part in bond formation