UPSC NDA I 2019 General Ability Solved Paper

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Question : 84 of 150

Marks: +1, -0

In which of the following pairs are the ions isoelectronic?

[NDA I 2019]

Mg‌2+ , Ar
Na‌+ , O‌2−
Al‌3+, Cl‌−
K‌+ , Ne

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