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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 4 September 2020, Shift 1, Chemistry Q29

Question 29 of 75 in this shift, Chemistry question 4 of 25.

For one mole of an ideal gas, which of these statements must be true ? (a) U and H each depends only on temperature (b) Compressibility factor zz is not equal to 1 (c) CP,m−CV,m=R\mathrm{C_{P,m} - C_{V,m} = R} (d) dU=CVdT\mathrm{dU = C_V dT} for any process
  1. (1)(c) and (d)
  2. (2)(a) and (c)
  3. (3)(b), (c) and (d)
  4. (4)(a), (c) and (d)Official answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
Thermodynamics (Chemistry)
Topic
Enthalpy and Hess's Law
Idea tested
Heat Capacity Relation in Enthalpy

Same idea in other shifts

Asked 3× in all
  1. 4 Apr 2026, Shift 1 · Q54Given below are two statements: Statement I: For an ideal gas, heat capacity at constant volume is always greater than the heat capacity…EasyTwo statements
  2. 27 Jul 2022, Shift 1 · Q84The molar heat capacity for an ideal gas at constant pressure is 20.785 J K−1^{-1}mol−1^{-1}. The change in internal energy is 5000 J upon…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.