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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 17 March 2021, Shift 2, Chemistry Q32

Question 32 of 90 in this shift, Chemistry question 2 of 30, Section A.

During which of the following processes, does entropy decrease ? (A) Freezing of water to ice at 0∘C0^\circ\mathrm{C} (B) Freezing of water to ice at −10∘C-10^\circ\mathrm{C} (C) N2(g)+3H2(g)→2NH3(g)\mathrm{N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)} (D) Adsorption of CO(g)\mathrm{CO(g)} on lead surface. (E) Dissolution of NaCl\mathrm{NaCl} in water Choose the correct answer from the options given below :
  1. (1)(A), (B), (C) and (D) onlyOfficial answer
  2. (2)(A), (C) and (E) only
  3. (3)(A) and (E) only
  4. (4)(B) and (C) only

Official answer

Option 1

NTA final key.

Chapter
Thermodynamics (Chemistry)
Topic
Entropy
Idea tested
Predicting Entropy Sign

Same topic in other shifts

All Entropy questions
  1. 12 Apr 2023, Shift 1 · Q83One mole of an ideal gas at 350K is in a 2.0 L vessel of thermally conducting walls, which are in contact with the surroundings. It…MediumNumerical value
  2. 15 Apr 2023, Shift 1 · Q8230.4 kJ of heat is required to melt one mole of sodium chloride and the entropy change at the melting point is 28.4 J…EasyNumerical value
  3. 9 Jan 2020, Shift 2 · Q26The true statement amongst the following is :EasySingle 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.