JEE Main 2026 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 6 April 2026, Shift 1, Chemistry Q71

Question 71 of 75 in this shift, Chemistry question 21 of 25, Section B.

First and second ionization enthalpies of lithium are 520 kJ mol

^{-1}

and 7297 kJ mol

^{-1}

respectively. Energy required to convert 3.5 mg lithium (g) into

\mathrm{Li^{2+}(g)}

[

\mathrm{Li(g)\rightarrow Li^{2+}(g)}

] is ________ kJ mol

^{-1}

. (nearest integer) [Molar mass of Li = 7 g mol

^{-1}

]

Official answer

NTA final key.

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

Same idea in other shifts

Asked 7× in all

2 Apr 2026, Shift 2 · Q59Given below are two statements: Statement I: The second ionization enthalpy of B, Al and Ga is in the order of B > Al > Ga. Statement II:…MediumSingle correct
6 Apr 2026, Shift 2 · Q58In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right…EasySingle correct
8 Apr 2026, Shift 2 · Q58Match List - I with List - II. List - I (Electronic configuration of neutral atom (where n = 2)) | List - II (1 $^{st}$ Ionization Energy…MediumMatch the list
3 Apr 2025, Shift 1 · Q60Which of the following statements are correct ? A. The process of adding an electron to a neutral gaseous atom is always exothermic. B.…MediumOther
8 Apr 2025, Shift 2 · Q56The atomic number of the element from the following with lowest 1 $^{st}$ ionisation enthalpy is :EasySingle correct
29 Jan 2024, Shift 1 · Q64Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : The first ionisation…EasyAssertion–reason

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.