Question

In context of the lanthanoids, which of the following statements is not correct?
A. There is a gradual decrease in the radii of the members with increasing atomic number in the series
B. All the members exhibit + 3 oxidation state
C. Because of similar properties, the separation of lanthanoids is not easy
D. Availability of 4f electrons results in the formation of compounds in + 4 state for all the members of the series

Answer 1

Correct Answer - D
Formation of + 4 state requires very high energy, thus incorrect.