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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 4 September 2020, Shift 2, Chemistry Q32

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

The process that is NOT endothermic in nature is :
  1. (1)H(g)+e−→H(g)−\mathrm{H_{(g)} + e^- \rightarrow H^-_{(g)}}Official answer
  2. (2)Ar(g)+e−→Ar(g)−\mathrm{Ar_{(g)} + e^- \rightarrow Ar^-_{(g)}}
  3. (3)O(g)−+e−→O(g)2−\mathrm{O^-_{(g)} + e^- \rightarrow O^{2-}_{(g)}}
  4. (4)Na(g)→Na(g)++e−\mathrm{Na_{(g)} \rightarrow Na^+_{(g)} + e^-}

Official answer

Option 1

NTA final key (Sep 2020).

Chapter
Classification of Elements and Periodicity in Properties
Topic
Periodic Trends
Idea tested
Positive Electron Gain Enthalpy

Same idea in other shifts

Asked 2× in all
  1. 6 Apr 2023, Shift 1 · Q64The difference between electron gain enthalpies will be maximum between:MediumSingle 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 108 of the 174 JEE Main shifts held from 2017 to 2026.