Which of the following pairs has the same size ?

Options

A. `Zn^(2+), Hf^(4+)`
B. `Fe^(2+), Ni^(2+)`
C. `Zr^(4+), Ti^(4+)`
D. `Zr^(4+), Hf^(4+)`

Answer

D

Explanation

`Zr^(4+)` and `Hf^(4+)` have similar ionic radii due to lanthanoid contraction.