Which of the following pairs has the same size

Which of the following pairs has the same size

Options

(a) Fe²⁺ , Ni²⁺
(b) Zr⁴⁺ , Ti⁴⁺
(c) Zr⁴⁺ , HF⁴⁺
(d) Zn²⁺ , HF⁴⁺

Correct Answer:

Zr⁴⁺ , HF⁴⁺

Explanation:

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