JEE Main 2023 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 8 April 2023, Shift 2, Chemistry Q90

Question 90 of 90 in this shift, Chemistry question 30 of 30, Section B.

The observed magnetic moment of the complex

[\mathrm{Mn(NCS)_6}]^{x-}

is 6.06 BM. The numerical value of

x

is ____________.

Official answer

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

4 Apr 2026, Shift 1 · Q62Match the LIST-I with LIST-II List-I (Complex ion): A. $[\mathrm{Cr(H_2O)_6}]^{2+}$ ; B. $[\mathrm{Co(H_2O)_6}]^{2+}$ ; C.…EasyMatch the list
8 Apr 2025, Shift 2 · Q60Match the LIST-I with LIST-II LIST-I (Complex/ Species) | LIST-II (Shape & magnetic moment) A. $\mathrm{[Ni(CO)_4]}$ | I. Tetrahedral, 2.8…MediumMatch the list
31 Jan 2024, Shift 1 · Q86The 'Spin only' Magnetic moment for $[\mathrm{Ni(NH_3)_6}]^{2+}$ is _________ $\times10^{-1}$ BM. (given = Atomic number of Ni : 28)EasyNumerical value
31 Jan 2024, Shift 2 · Q70Select the option with correct property -MediumSingle correct
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 Apr 2023, Shift 2 · Q69Match List I with List II LIST I (Coordination Complex): A. $[\mathrm{Cr(CN)_6}]^{3-}$ ; B. $[\mathrm{Fe(H_2O)_6}]^{2+}$ ; C.…MediumMatch the list
11 Apr 2023, Shift 1 · Q88The ratio of spin-only magnetic moment values…EasyNumerical value
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.