Learn

Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 26 August 2021, Shift 1, Chemistry Q34

Question 34 of 90 in this shift, Chemistry question 4 of 30, Section A.

Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface ?
  1. (1)ΔH>0,ΔS>0\Delta \mathrm{H} > 0, \Delta \mathrm{S} > 0
  2. (2)ΔH<0,ΔS>0\Delta \mathrm{H} < 0, \Delta \mathrm{S} > 0
  3. (3)ΔH>0,ΔS<0\Delta \mathrm{H} > 0, \Delta \mathrm{S} < 0
  4. (4)ΔH<0,ΔS<0\Delta \mathrm{H} < 0, \Delta \mathrm{S} < 0Official answer

Official answer

Option 4

NTA final key.

Chapter
Surface Chemistry
Topic
Adsorption
Idea tested
Thermodynamics of Adsorption

Same idea in other shifts

Asked 2× in all
  1. 10 Apr 2023, Shift 1 · Q63The enthalpy change for the adsorption process and micelle formation respectively areMediumSingle 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.