Question

Which of the following pairs has the same size?
(a) Fe²⁺, Ni²⁺
(b) Zr⁴⁺, Ti⁴⁺
(c) Zr⁴⁺, Hf⁴⁺
(d) Zn²⁺, Hf⁴⁺

Answer 1

C IS CORRECT ANSWER..........

Answer 2

${\huge {\mathfrak {Answer :-}}}$

➡️ Option (C)

That's it..