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Saturday, 31 October

JEE Main 2026 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 2 April 2026, Shift 1, Chemistry Q52

Question 52 of 75 in this shift, Chemistry question 2 of 25, Section A.

What is the energy (in J atom−1\mathrm{J\ atom^{-1}}) required for the following process ? Li2+(g)→Li3+(g)+e−\mathrm{Li^{2+}(g)\rightarrow Li^{3+}(g)+e^-} (Take the ionization energy for the H atom in the ground state as 2.18×10−18 J atom−12.18\times10^{-18}\ \mathrm{J\ atom^{-1}})
  1. (1)8.72×10−188.72\times10^{-18}
  2. (2)1.962×10−181.962\times10^{-18}
  3. (3)1.962×10−171.962\times10^{-17}Official answer
  4. (4)6.54×10−176.54\times10^{-17}

Official answer

Option 3

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
  1. 31 Jan 2024, Shift 1 · Q82The ionization energy of sodium in kJ mol−1^{-1}, if electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium…MediumNumerical value
  2. 10 Apr 2023, Shift 2 · Q81The electron in the nthn^{th} orbit of Li2+\mathrm{Li^{2+}} is excited to (n+1)(n + 1) orbit using the radiation of energy…MediumNumerical valueHas a figure
  3. 28 Jul 2022, Shift 2 · Q53If the wavelength for an electron emitted from H-atom is 3.3×10−103.3\times10^{-10} m, then energy absorbed by the electron in its ground state…MediumNumerical value
  4. 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×10−8x \times 10^{-8} m. The…MediumNumerical value
  5. 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.