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 :
Availability of $$4f$$ electrons results in the formation of compounds in + 4 state for all the members of the series.
Solution :
The most stable oxidation states of lanthanides is + 3.