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Saturday, 31 October

JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 30 June 2022, Shift 1, Chemistry Q83

Question 83 of 90 in this shift, Chemistry question 23 of 30, Section B.

1.0 mol of monoatomic ideal gas is expanded from state 1 to state 2 as shown in the figure. The magnitude of the work done for the expansion of gas from state 1 to state 2 at 300 K is ___________ J. (Nearest integer) (Given : R=8.3 J K−1^{-1} mol−1^{-1}, ln10=2.3, log2=0.30)

The figure, in words

P (bar) vs V (L) graph: a curve falling from State 1 (P = 6.0 bar, V = 22.7 L, dashed guides to both axes) to State 2 (P = 3.0 bar, dashed guide to the P axis).

Official answer

1718

NTA final key.

Chapter
Thermodynamics (Chemistry)
Topic
First Law of Thermodynamics
Idea tested
Work and Heat in Isothermal Processes

Same idea in other shifts

Asked 4× in all
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  2. 4 Apr 2024, Shift 2 · Q83Three moles of an ideal gas are compressed isothermally from 60 L to 20 L using constant pressure of 5 atm. Heat exchange Q for the…EasyNumerical value
  3. 27 Jun 2022, Shift 2 · Q84When 5 moles of He gas expand isothermally and reversibly at 300 K from 10 litre to 20 litre, the magnitude of the maximum work obtained…EasyNumerical 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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.