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Question

From the following pairs of ions which one is not an iso-electronic pair ?

Options :

  1. O²⁻, F⁻

  2. Na⁺, Mg²⁺

  3. Mn²⁺, Fe³⁺

  4. Fe²⁺, Mn²⁺

Show Answer

Answer :

Fe²⁺, Mn²⁺

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