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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 29 June 2022, Shift 2, Chemistry Q63

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

Consider the species CH4\mathrm{CH_4}, NH4+\mathrm{NH_4^{+}} and BH4−\mathrm{BH_4^{-}}. Choose the correct option with respect to the there species.
  1. (1)They are isoelectronic and only two have tetrahedral structures.
  2. (2)They are isoelectronic and all have tetrahedral structures.Official answer
  3. (3)Only two are isoelectronic and all have tetrahedral structures.
  4. (4)Only two are isoelectronic and only two have tetrahedral structures.

Official answer

Option 2

NTA final key.

Chapter
Chemical Bonding and Molecular Structure
Topic
VSEPR Theory
Idea tested
Isoelectronic and Isostructural Principle

Same idea in other shifts

Asked 2× in all
  1. 6 Apr 2026, Shift 1 · Q54The pairs among A=[SO32−,CO32−]\mathrm{A}=\left[\mathrm{SO_3^{2-},CO_3^{2-}}\right], B=[O22−,F2]\mathrm{B}=\left[\mathrm{O_2^{2-},F_2}\right],…MediumSingle correct

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.