In which of the following pairs,

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Question:
In which of the following pairs, the ions are iso-electronic?

(i) Na+, Mg2+

(ii) Al3+, O–

(iii) Na+, O2-

(iv) N3-, Cl–

Solution:

Option (i) Na+, Mg2+ and (iii) Na+, O2- are the answers.

In which of the following pairs,

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