d and f BLOCK ELEMENTS

For which Lanthanoids does the text explicitly state that the +4 oxidation state is observed only in oxides (MO₂)?

• Pr, Nd, Tb, and Dy
• Ce, Tb, and Eu
• La, Gd, and Lu
• Sm, Eu, and Yb

What specific property of Tb⁴⁺ is attributed to its f⁷ electronic configuration?

• It accounts for the formation of this ion and makes it an oxidant
• It makes it a strong reducing agent
• It makes it paramagnetic
• It makes it colorless

What specific property of Yb²⁺ is attributed to its f¹⁴ electronic configuration?

• It makes Yb²⁺ a reductant
• It makes it a strong oxidant
• It makes it diamagnetic
• It makes it highly colored

What specific property of Eu²⁺ is attributed to its f⁷ electronic configuration?

• It accounts for the formation of this ion and makes it a strong reducing agent
• It makes it a strong oxidant
• It makes it paramagnetic
• It makes it colorless

Which of the following best explains why Ce⁴⁺ has a strong tendency to revert to the Ce³⁺ state?

• Ce⁴⁺ is a strong oxidant
• Ce⁴⁺ is unstable
• Ce³⁺ is a strong oxidant
• Ce⁴⁺ has a larger radius than Ce³⁺