Q. Which of the following oxidation states is the most common among the lanthanoids?
A) 4
B) 2
C) 5
D) 3
Explanation
[Solution from source] All lanthanoids show the +3 oxidation state, which is the characteristic and most common one. +2 (Eu, Yb) and +4 (Ce) occur only for a few elements with stable f⁰, f⁷ or f¹⁴ configurations. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.