JEE MAIN - Chemistry (2011 - No. 19)
In context of the lanthanoids, which of the following statements is not correct?
All the members exhibit +3 oxidation state
Because of similar properties the separation of lanthanoids is not easy.
Availability of 4f electrons results in the formation of compounds in +4 state for all the members
of the series.
There is a gradual decrease in the radii of the members with increasing atomic number in the
series.
Explication
The number stable oxidation states of lanthanides is $$+3$$.