Learn

Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceMatch the listMediumMulti-step

JEE Main 8 April 2024, Shift 2, Chemistry Q70

Question 70 of 90 in this shift, Chemistry question 10 of 30, Section A.

Match List - I with List - II. List - I (Complex ion) | List - II (Spin only magnetic moment in B.M.) (A) [Cr(NH3)6]3+[\mathrm{Cr(NH_3)_6}]^{3+} | (I) 4.90 (B) [NiCl4]2−[\mathrm{NiCl_4}]^{2-} | (II) 3.87 (C) [CoF6]3−[\mathrm{CoF_6}]^{3-} | (III) 0.0 (D) [Ni(CN)4]2−[\mathrm{Ni(CN)_4}]^{2-} | (IV) 2.83 Choose the correct answer from the options given below :
  1. (1)(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
  2. (2)(A)-(II), (B)-(IV), (C)-(I), (D)-(III)Official answer
  3. (3)(A)-(I), (B)-(IV), (C)-(II), (D)-(III)
  4. (4)(A)-(II), (B)-(III), (C)-(I), (D)-(IV)

Official answer

Option 2

NTA final key.

Chapter
Coordination Compounds
Topic
Crystal Field Theory
Idea tested
Spin-only Magnetic Moment

Same idea in other shifts

Asked 28× in all
  1. 4 Apr 2026, Shift 1 · Q62Match the LIST-I with LIST-II List-I (Complex ion): A. [Cr(H2O)6]2+[\mathrm{Cr(H_2O)_6}]^{2+}; B. [Co(H2O)6]2+[\mathrm{Co(H_2O)_6}]^{2+}; C.…EasyMatch the list
  2. 8 Apr 2025, Shift 2 · Q60Match the LIST-I with LIST-II LIST-I (Complex/ Species) | LIST-II (Shape & magnetic moment) A. [Ni(CO)4]\mathrm{[Ni(CO)_4]} | I. Tetrahedral, 2.8…MediumMatch the list
  3. 5 Apr 2024, Shift 1 · Q71Which one of the following complexes will exhibit the least paramagnetic behaviour ? [Atomic number, Cr = 24, Mn = 25, Fe = 26, Co = 27]EasySingle correct
  4. 27 Jan 2024, Shift 1 · Q69Consider the following complex ions P=[FeF6]3−\mathrm{P=[FeF_6]^{3-}} Q=[V(H2O)6]2+\mathrm{Q=[V(H_2O)_6]^{2+}} R=[Fe(H2O)6]2+\mathrm{R=[Fe(H_2O)_6]^{2+}} The correct…MediumSingle correct
  5. 31 Jan 2024, Shift 1 · Q86The 'Spin only' Magnetic moment for [Ni(NH3)6]2+[\mathrm{Ni(NH_3)_6}]^{2+} is _________ ×10−1\times10^{-1} BM. (given = Atomic number of Ni : 28)EasyNumerical value
  6. 31 Jan 2024, Shift 2 · Q70Select the option with correct property -MediumSingle correct
  7. 6 Apr 2023, Shift 1 · Q72Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The spin only magnetic…MediumAssertion–reason
  8. 8 Apr 2023, Shift 1 · Q72The correct order of spin only magnetic moments for the following complex ions isMediumSingle 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.