Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being :

Amount of oxalic acid present in a solution can be determined by its titration with $$KMn{O_4}$$ solution in the presence of $${H_2}S{O_4}.$$ The titration gives unsatisfactory result when carried out in the presence of $$HCl,$$ because $$HCl$$ :

The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because :

Identify the incorrect statement among the following :