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Friday, 9 October

JEE Main 2020 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 8 January 2020, Shift 1, Chemistry Q47

Question 47 of 75 in this shift, Chemistry question 22 of 25, Section B.

The magnitude of work done by a gas that undergoes a reversible expansion along the path ABC shown in the figure is ______.

The figure, in words

Pressure (Pa) vs Volume (m^3) graph. P ticks 4, 6, 8, 10; V ticks 4, 6, 8, 10, 12; axis crossing labelled (2, 2). A is at P = 8 on the P side; AB is horizontal at P = 8 up to V = 8 (B); BC is a straight line sloping down from B to C on the V axis at V = 12.

Official answer

48.00 to 48.00

NTA final key (Jan 2020). Any value in the range scored.

Chapter
Thermodynamics (Chemistry)
Topic
First Law of Thermodynamics
Idea tested
Work Done from P-V Graph Area

Same topic in other shifts

All First Law of Thermodynamics questions
  1. 2 Apr 2026, Shift 1 · Q47A vessel contains 0.15 m30.15\ \mathrm{m^3} of a gas at pressure 88 bar and temperature 140 ∘140\ ^\circC with cp=3Rc_p=3R and cv=2Rc_v=2R. It is…MediumNumerical value
  2. 2 Apr 2026, Shift 2 · Q485 moles of unknown gas is heated at constant volume from 10°C to 20°C. The molar specific heat of this gas at constant pressure cp=8c_p = 8…MediumNumerical value
  3. 5 Apr 2026, Shift 1 · Q33Consider the following statements: A. Zeroth law of thermodynamics gives concept of temperature B. First law of thermodynamics gives…MediumOther
  4. 6 Apr 2026, Shift 1 · Q50A certain gas is isothermally compressed to (13)rd\left(\frac{1}{3}\right)^{\mathrm{rd}} of its initial volume (V0=3V_0=3 litre) by applying…MediumNumerical value
  5. 6 Apr 2026, Shift 2 · Q35If 2 mole of an ideal monoatomic gas at temperature TT, is mixed with 6 mole of another ideal monoatomic gas at temperature 2T2T then the…EasySingle correct
  6. 8 Apr 2026, Shift 2 · Q35One mole of diatomic gas having rotational modes only is kept in a cylinder with a piston system. The cross-section area of the cylinder…MediumSingle 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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.