Question

The lanthanoid contraction is responsible for the fact that:

• A. Zr and Y have about the same radius
• B. Zr and Nb have similar oxidation state
• C. Zr and Hf have about same radius
• D. Zr and Zn have the same oxidation state

Answer 1

The correct option is C Zr and Hf have about same radius

Because of lanthanoid contraction, Zr and Hf have nearly same atomic size.
Zr = 230 pm, Hf = 225 pm