JEE Main 2026 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 4 April 2026, Shift 2, Chemistry Q57

Question 57 of 75 in this shift, Chemistry question 7 of 25, Section A.

The

1^{\text{st}}

ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the

2^{\text{nd}}

ionization enthalpy of Mg is ________.

(1) $-906$ kJ/mol
(2) $-856$ kJ/mol
(3)+1450 kJ/molOfficial answer
(4)+590 kJ/mol

Official answer

Option 3

NTA final key.

Chapter: Classification of Elements and Periodicity in Properties
Topic: Periodic Trends
Idea tested: Successive Ionization Enthalpy Jumps

Same idea in other shifts

Asked 4× in all

2 Apr 2026, Shift 1 · Q59Given below are two statements : Statement (I) : The first ionisation enthalpy of the elements Na, Mg, Cl and Ar follows the order Na > Mg…MediumTwo statements
16 Mar 2021, Shift 2 · Q36Identify the elements X and Y using the ionisation energy values given below : Ionization energy (kJ/mol) 1st 2nd X 495 4563 Y 731 1450EasySingle correct
9 Jan 2020, Shift 2 · Q32The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol $^{-1}$ , respectively. How many moles of HCl and…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.