JEE Main 2023 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 11 April 2023, Shift 1, Chemistry Q64

Question 64 of 90 in this shift, Chemistry question 4 of 30, Section A.

For elements B, C, N, Li, Be, O and F, the correct order of first ionization enthalpy is

(1)Li < Be < B < C < N < O < F
(2)Li < B < Be < C < O < N < FOfficial answer
(3)B > Li > Be > C > N > O > F
(4)Li < Be < B < C < O < N < F

Official answer

Option 2

NTA final key.

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

Same topic in other shifts

All Periodic Trends questions

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2 Apr 2026, Shift 2 · Q58The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is:MediumSingle correct
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
4 Apr 2026, Shift 1 · Q59Given below are two statements: Statement I: The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of…MediumTwo statements
4 Apr 2026, Shift 2 · Q57The $1^{\text{st}}$ ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the $2^{\text{nd}}$ ionization…EasySingle correct
5 Apr 2026, Shift 1 · Q58Given below are two statements: Statement I: The correct order of electronegativity of fluorine, oxygen and nitrogen is F > O > N.…EasyTwo statements

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.