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Friday, 9 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 2× 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

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.