NEET UG 2020 · Chemistry · Question 104
NEET 2020 Chemistry, question 104
Question 104 of the NEET 2020 paper (code E1) is a Chemistry question from Thermodynamics. Its idea, Free Expansion of an Ideal Gas, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.
Updated 2026-10-08
Q104 · Chemistry
The correct option for free expansion of an ideal gas under adiabatic condition is :
- 1q = 0, T = 0 and w = 0Official answer
- 2q = 0, T < 0 and w > 0
- 3q < 0, T = 0 and w = 0
- 4q > 0, T > 0 and w > 0
Official answer: option 1 · NTA final answer key
Same idea
The only question on Free Expansion of an Ideal Gas
No other NEET paper from 2017–2026 tested this exact idea.
Free Expansion of an Ideal Gas: every question and how it was framed
The chapter
Thermodynamics in ten years of NEET
32 questions from 2017–2026, asked in 10 of 10 papers, about 3.1 a paper. First Law of Thermodynamics alone had 8.