NEET UG 2021 · Chemistry · Question 70
NEET 2021 Chemistry, question 70
Question 70 of the NEET 2021 paper (code O1) is a Chemistry question from States of Matter. Its idea, Isotherm Temperature Comparison, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 2.
Updated 2026-10-08
Q70 · Chemistry
Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a gas at different temperatures :
The figure, described in words
Four P vs V graphs at 200 K, 400 K, 600 K: (1) straight lines through origin, 200 K steepest; (2) hyperbolas with 600 K outermost; (3) hyperbolas with 200 K outermost; (4) one horizontal line for all temperatures.
- 1[graph: P vs V, straight lines through origin; slope order 200 K > 400 K > 600 K]
- 2[graph: P vs V, rectangular hyperbolas; 600 K curve farthest from axes, then 400 K, then 200 K]Official answer
- 3[graph: P vs V, rectangular hyperbolas; 200 K curve farthest from axes, then 400 K, then 600 K]
- 4[graph: P vs V, single horizontal line labelled (200 K, 400 K, 600 K)]
Official answer: option 2 · NTA final answer key
Same idea
The only question on Isotherm Temperature Comparison
No other NEET paper from 2017–2026 tested this exact idea.
Isotherm Temperature Comparison: every question and how it was framed
The chapter
States of Matter in ten years of NEET
10 questions from 2017–2026, asked in 6 of 10 papers, about 0.9 a paper. Ideal Gas Law alone had 10.