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Saturday, 31 October

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JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 4 September 2020, Shift 2, Chemistry Q29

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

Five moles of an ideal gas at 1 bar and 298 K is expanded into vacuum to double the volume. The work done is :

(1)zeroOfficial answer
(2) $-RT\ \ln V_2/V_1$
(3) $-RT\ (V_2 - V_1)$
(4) $C_V(T_2 - T_1)$

Official answer

Option 1

NTA final key (Sep 2020).

Chapter: Thermodynamics (Chemistry)
Topic: No close match in our taxonomy
Idea tested: No close match in our taxonomy

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.