JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyData or graph

JEE Main 3 September 2020, Shift 2, Chemistry Q32

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

The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and 32824

\mathrm{kJ\ mol^{-1}}

. The number of valence electrons in the element is :

(1)4
(2)2
(3)3Official answer
(4)5

Official answer

Option 3

NTA final key (Sep 2020).

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

Same idea in other shifts

Asked 5× 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
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
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 108 of the 174 JEE Main shifts held from 2017 to 2026.