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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 25 July 2021, Shift 2, Chemistry Q34

Question 34 of 90 in this shift, Chemistry question 4 of 30, Section A.

The ionic radii of F−\mathrm{F^{-}} and O2−\mathrm{O^{2-}} respectively are 1.33 Å and 1.4 Å, while the covalent radius of N is 0.74 Å. The correct statement for the ionic radius of N3−\mathrm{N^{3-}} from the following is :
  1. (1)It is smaller than O2−\mathrm{O^{2-}} and F−\mathrm{F^{-}}, but bigger than of N
  2. (2)It is bigger than O2−\mathrm{O^{2-}} and F−\mathrm{F^{-}}Official answer
  3. (3)It is bigger than F−\mathrm{F^{-}} and N, but smaller than of O2−\mathrm{O^{2-}}
  4. (4)It is smaller than F−\mathrm{F^{-}} and N

Official answer

Option 2

NTA final key.

Chapter
Classification of Elements and Periodicity in Properties
Topic
Periodic Trends
Idea tested
Isoelectronic Species Radii Comparison

Same idea in other shifts

Asked 10× in all
  1. 5 Apr 2024, Shift 1 · Q66The statement(s) that are correct about the species O2−\mathrm{O^{2-}}, F−\mathrm{F^-}, Na+\mathrm{Na^+} and Mg2+\mathrm{Mg^{2+}}. (A) All are…EasyOther
  2. 1 Feb 2024, Shift 1 · Q65In case of isoelectronic species the size of F−\mathrm{F^-}, Ne and Na+\mathrm{Na^+} is affected by :EasySingle correct
  3. 15 Apr 2023, Shift 1 · Q87The total number of isoelectronic species from the given set is __________. O2−,F−,Al,Mg2+,Na+,O+,Mg,Al3+,F\mathrm{O^{2-}, F^-, Al, Mg^{2+}, Na^+, O^+, Mg, Al^{3+}, F}EasyNumerical value
  4. 27 Jun 2022, Shift 1 · Q65Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The ionic radii…EasyAssertion–reason
  5. 27 Jun 2022, Shift 2 · Q65The correct order of increasing ionic radii isEasySingle correct
  6. 27 Aug 2021, Shift 2 · Q32The correct order of ionic radii for the ions, P3−\mathrm{P^{3-}}, S2−\mathrm{S^{2-}}, Ca2+\mathrm{Ca^{2+}}, K+\mathrm{K^{+}},…EasySingle correct
  7. 25 Jul 2021, Shift 1 · Q33The ionic radii of K+\mathrm{K^+}, Na+\mathrm{Na^+}, Al3+\mathrm{Al^{3+}} and Mg2+\mathrm{Mg^{2+}} are in the order :EasySingle correct
  8. 18 Mar 2021, Shift 1 · Q34The ionic radius of Na+\mathrm{Na^+} ion is 1.02 Å. The ionic radii (in Å) of Mg2+\mathrm{Mg^{2+}} and Al3+\mathrm{Al^{3+}}, respectively, are :EasySingle 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.