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Saturday, 10 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 31 January 2024, Shift 2, Chemistry Q70

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

Select the option with correct property -
  1. (1)[NiCl4]2−\mathrm{[NiCl_4]^{2-}} Diamagnetic, [Ni(CO)4]\mathrm{[Ni(CO)_4]} Paramagnetic
  2. (2)[Ni(CO)4]\mathrm{[Ni(CO)_4]} Diamagnetic, [NiCl4]2−\mathrm{[NiCl_4]^{2-}} ParamagneticOfficial answer
  3. (3)[Ni(CO)4]\mathrm{[Ni(CO)_4]} and [NiCl4]2−\mathrm{[NiCl_4]^{2-}} both Diamagnetic
  4. (4)[Ni(CO)4]\mathrm{[Ni(CO)_4]} and [NiCl4]2−\mathrm{[NiCl_4]^{2-}} both Paramagnetic

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 9× 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. 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
  4. 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
  5. 8 Apr 2023, Shift 2 · Q69Match List I with List II LIST I (Coordination Complex): A. [Cr(CN)6]3−[\mathrm{Cr(CN)_6}]^{3-}; B. [Fe(H2O)6]2+[\mathrm{Fe(H_2O)_6}]^{2+}; C.…MediumMatch the list
  6. 8 Apr 2023, Shift 2 · Q90The observed magnetic moment of the complex [Mn(NCS)6]x−[\mathrm{Mn(NCS)_6}]^{x-} is 6.06 BM. The numerical value of xx is ____________.MediumNumerical value
  7. 11 Apr 2023, Shift 1 · Q88The ratio of spin-only magnetic moment values…EasyNumerical value
  8. 13 Apr 2023, Shift 2 · Q70Which of the following complexes will exhibit maximum attraction to an applied magnetic field?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 42 of the 174 JEE Main shifts held from 2017 to 2026.