JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 18 March 2021, Shift 2, Chemistry Q34

Question 34 of 90 in this shift, Chemistry question 4 of 30, Section A.

The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are :

(1)argon, chlorine and sodiumOfficial answer
(2)chlorine, lithium and sodium
(3)argon, lithium and sodium
(4)neon, sodium and chlorine

Official answer

Option 1

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 14× 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 1 · Q71First and second ionization enthalpies of lithium are 520 kJ mol $^{-1}$ and 7297 kJ mol $^{-1}$ respectively. Energy required to convert…EasyNumerical value
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
4 Apr 2024, Shift 1 · Q66The correct order of first ionization enthalpy values of the following elements is : (A) O (B) N (C) Be (D) F (E) B Choose the correct…MediumOther
4 Apr 2024, Shift 2 · Q66Given below are two statements : Statement I : The correct order of first ionization enthalpy values of Li, Na, F and Cl is Na < Li < Cl <…MediumTwo 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 108 of the 174 JEE Main shifts held from 2017 to 2026.