JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 9 April 2024, Shift 2, Chemistry Q86

Question 86 of 90 in this shift, Chemistry question 26 of 30, Section B.

A transition metal 'M' among Sc, Ti, V, Cr, Mn and Fe has the highest second ionisation enthalpy. The spin-only magnetic moment value of

\mathrm{M^{+}}

ion is ________ BM (Near integer) (Given atomic number Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26)

Official answer

NTA final key.

Chapter: The d- and f-Block Elements
Topic: d-Block Elements
Idea tested: Ionization Enthalpy Irregularities

Same idea in other shifts

Asked 4× in all

6 Apr 2026, Shift 2 · Q60The correct order of first ( $\Delta_iH_1$ ) and second ( $\Delta_iH_2$ ) ionisation enthalpy values of Cr and Mn are : A. $\Delta_iH_1$ : Cr…MediumOther
3 Aug 2021, Shift 1 · Q33The correct order of second ionization enthalpy isMediumSingle correct
8 Jan 2020, Shift 1 · Q36The third ionization enthalpy is minimum for :MediumSingle 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.