JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 25 June 2022, Shift 1, Chemistry Q63

Question 63 of 90 in this shift, Chemistry question 3 of 30, Section A.

The pair, in which ions are isoelectronic with

\mathrm{Al^{3+}}

is :

(1) $\mathrm{Br^-}$ and $\mathrm{Be^{2+}}$
(2) $\mathrm{Cl^-}$ and $\mathrm{Li^+}$
(3) $\mathrm{S^{2-}}$ and $\mathrm{K^+}$
(4) $\mathrm{O^{2-}}$ and $\mathrm{Mg^{2+}}$ Official answer

Official answer

Option 4

NTA final key.

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

Same topic in other shifts

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.