JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyMulti-step

JEE Main 9 January 2020, Shift 2, Chemistry Q32

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

The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol

^{-1}

, respectively. How many moles of HCl and

\mathrm{H_2SO_4}

, respectively, will be needed to react completely with 1 mole of the metal hydroxide ?

(1)1 and 1
(2)2 and 0.5
(3)1 and 2
(4)1 and 0.5Official answer

Official answer

Option 4

NTA final key (Jan 2020).

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

Same idea in other shifts

Asked 4× 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

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.