JEE Main 2017 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 2 April 2017 (offline), Chemistry Q45

Question 45 of 90 in this shift, Chemistry question 15 of 30.

The group having isoelectronic species is :

(1) $\mathrm{O^{2-}, F^-, Na, Mg^{2+}}$
(2) $\mathrm{O^-, F^-, Na^+, Mg^{2+}}$
(3) $\mathrm{O^{2-}, F^-, Na^+, Mg^{2+}}$ Official answer
(4) $\mathrm{O^-, F^-, Na, Mg^+}$

Official answer

Option 3

CBSE answer key (25/04/2017, used for result).

Chapter: Classification of Elements and Periodicity in Properties
Topic: Quantum Numbers
Idea tested: Configurations of Isoelectronic Species

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Question text from the official JEE Main paper published by NTA (CBSE ran the 2017 exam); answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.