JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 8 January 2020, Shift 1, Chemistry Q32

Question 32 of 75 in this shift, Chemistry question 7 of 25, Section A.

The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are :

(1)496, 577, 737, 786
(2)786, 737, 577, 496
(3)496, 737, 577, 786Official answer
(4)496, 577, 786, 737

Official answer

Option 3

NTA final key (Jan 2020).

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

Same topic in other shifts

All Periodic Trends questions

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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.