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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceAssertion–reasonEasyConceptual

JEE Main 27 June 2022, Shift 1, Chemistry Q65

Question 65 of 90 in this shift, Chemistry question 5 of 30, Section A.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The ionic radii of O2−\mathrm{O^{2-}} and Mg2+\mathrm{Mg^{2+}} are same. Reason (R) : Both O2−\mathrm{O^{2-}} and Mg2+\mathrm{Mg^{2+}} are isoelectronic species. In the light of the above statements, choose the correct answer from the options given below.
  1. (1)Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. (2)Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (3)(A) is true but (R) is false.
  4. (4)(A) is false but (R) is true.Official answer

Official answer

Option 4

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 2 · Q65The correct order of increasing ionic radii isEasySingle correct
  5. 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
  6. 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
  7. 25 Jul 2021, Shift 2 · Q34The 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…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.