In the redox titration of fe2+ with ce4+ to form fe3+ and ce3+ what is the predominant form of cerium after 120 ml of ce4+ has been added to the fe2+ solution? a.) ce1+ b.) ce2+ c.) ce3+ d.) ce4+

Actually the answer to this problem primarily depends on how much Fe2+ is initially contained in the solution.  So if in case it contains more or equal amount than the cerium solution, then the answer is C. But if it has much less, then it would be D.

But I believe the answer in this case is:
C

false

because it does not have the potential to be entirely used up

i think it is true since you can test the answer and can use observations to complete it.