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Saturday, 31 October

JEE Main 2023 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 8 April 2023, Shift 1, Chemistry Q81

Question 81 of 90 in this shift, Chemistry question 21 of 30, Section B.

[figure: three bulbs joined by pipes with stopcocks] Three bulbs are filled with CH4\mathrm{CH_4}, CO2\mathrm{CO_2} and Ne as shown in the picture. The bulbs are connected through pipes of zero volume. When the stopcocks are opened and the temperature is kept constant throughout, the pressure of the system is found to be ________ atm. (Nearest integer)

The figure, in words

Three bulbs in a row connected by pipes with a stopcock between each pair: bulb 1 P = 2 atm, V = 2 L, CH4(g); bulb 2 P = 4 atm, V = 3 L, CO2(g); bulb 3 P = 3 atm, V = 4 L, Ne(g).

Official answer

3

NTA final key.

Chapter
States of Matter
Topic
Ideal Gas Laws
Idea tested
Connected Gas Bulbs Equilibrium

Same idea in other shifts

Asked 4× in all
  1. 6 Apr 2026, Shift 1 · Q35Two closed vessels of same volume are joined through a narrow tube and both vessels are filled with air of pressure 90 kPa and temperature…MediumSingle correct
  2. 4 Apr 2025, Shift 2 · Q45There are two vessels filled with an ideal gas where volume of one is double the volume of other. The large vessel contains the gas at 8…MediumSingle correct
  3. 27 Aug 2021, Shift 2 · Q52Two flasks I and II shown below are connected by a valve of negligible volume. [figure: two circular flasks joined through a valve; flask…MediumNumerical valueHas a figure

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.