Which of the following is a lanthanide ?

Which of the following lanthanide is commonly used?

Which of the following lanthanide is commonly used?

Which one of the following lanthanide ions does NOT exhibit paramagnetism?

Which of the following lanthanide oxide is used for making coloured goggles ?

Which one of the following lanthanide ions does NOT exhibit paramagnetism?

Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature ? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58)