JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 31 January 2024, Shift 1, Chemistry Q82

Question 82 of 90 in this shift, Chemistry question 22 of 30, Section B.

The ionization energy of sodium in kJ mol

^{-1}

, if electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium atom is _________.

Official answer

494

NTA final key.

Chapter: Structure of Atom
Topic: Bohr's Atomic Theory
Idea tested: Ionization and Excitation Energy

Same idea in other shifts

Asked 6× in all

2 Apr 2026, Shift 1 · Q52What is the energy (in $\mathrm{J\ atom^{-1}}$ ) required for the following process ? $\mathrm{Li^{2+}(g)\rightarrow Li^{3+}(g)+e^-}$ (Take…EasySingle correct
10 Apr 2023, Shift 2 · Q81The electron in the $n^{th}$ orbit of $\mathrm{Li^{2+}}$ is excited to $(n + 1)$ orbit using the radiation of energy…MediumNumerical valueHas a figure
28 Jul 2022, Shift 2 · Q53If the wavelength for an electron emitted from H-atom is $3.3\times10^{-10}$ m, then energy absorbed by the electron in its ground state…MediumNumerical value
25 Jun 2022, Shift 1 · Q83The longest wavelength of light that can be used for the ionisation of lithium atom (Li) in its ground state is $x \times 10^{-8}$ m. The…MediumNumerical value
25 Feb 2021, Shift 2 · Q53Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization energy of metal A in kJ…MediumNumerical value

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.