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JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 8 January 2020, Shift 2, Physics Q8

Question 8 of 75 in this shift, Physics question 8 of 25, Section A.

Consider a mixture of n moles of helium gas and 2n moles of oxygen gas (molecules taken to be rigid) as an ideal gas. Its

C_P/C_V

value will be :

(1) $67/45$
(2) $23/15$
(3) $19/13$ Official answer
(4) $40/27$

Official answer

Option 3

NTA final key (Jan 2020).

Chapter: Kinetic Theory
Topic: Kinetic Theory of Gases
Idea tested: Adiabatic Exponent of Gas Mixtures

Same idea in other shifts

Asked 2× in all

30 Jan 2024, Shift 2 · Q39If three moles of monoatomic gas $\left(\gamma = \frac{5}{3}\right)$ is mixed with two moles of a diatomic gas…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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.