JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 8 January 2020, Shift 1, Chemistry Q36

Question 36 of 75 in this shift, Chemistry question 11 of 25, Section A.

The third ionization enthalpy is minimum for :

(1)Ni
(2)Mn
(3)FeOfficial answer
(4)Co

Official answer

Option 3

NTA final key (Jan 2020).

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

Same idea in other shifts

Asked 3× 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
9 Apr 2024, Shift 2 · Q86A transition metal 'M' among Sc, Ti, V, Cr, Mn and Fe has the highest second ionisation enthalpy. The spin-only magnetic moment value of…MediumNumerical value

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.