Learn

Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 27 August 2021, Shift 2, Chemistry Q32

Question 32 of 90 in this shift, Chemistry question 2 of 30, Section A.

The correct order of ionic radii for the ions, P3−\mathrm{P^{3-}}, S2−\mathrm{S^{2-}}, Ca2+\mathrm{Ca^{2+}}, K+\mathrm{K^{+}}, Cl−\mathrm{Cl^{-}} is :
  1. (1)K+>Ca2+>P3−>S2−>Cl−\mathrm{K^{+} > Ca^{2+} > P^{3-} > S^{2-} > Cl^{-}}
  2. (2)P3−>S2−>Cl−>K+>Ca2+\mathrm{P^{3-} > S^{2-} > Cl^{-} > K^{+} > Ca^{2+}}Official answer
  3. (3)P3−>S2−>Cl−>Ca2+>K+\mathrm{P^{3-} > S^{2-} > Cl^{-} > Ca^{2+} > K^{+}}
  4. (4)Cl−>S2−>P3−>Ca2+>K+\mathrm{Cl^{-} > S^{2-} > P^{3-} > Ca^{2+} > K^{+}}

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. 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.