NEET UG 2025 · Chemistry · Question 81
NEET 2025 Chemistry, question 81
Question 81 of the NEET 2025 paper (code 45) is a Chemistry question from Solutions. Its idea, Positive and Negative Deviations, was asked 3 times, in 2020, 2025 and 2026, across NEET 2017–2026. The NTA final answer key gives option 2.
Updated 2026-10-08
Q81 · Chemistry
5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively. Which of the following is true regarding the described solution?
- 1The solution shows positive deviation.
- 2The solution shows negative deviation.Official answer
- 3The solution is ideal.
- 4The solution has volume greater than the sum of individual volumes.
Official answer: option 2 · NTA final answer key
Same idea
Positive and Negative Deviations, in other papers
NEET asked this idea 3 times, in 2020, 2025 and 2026. The other 2 questions below.
- 2026 Q71Consider the following statements about the solutions formed by mixing two liquids. A. An ideal solution thus formed obeys Raoult's law…Other · Medium
- 2020 Q115The mixture which shows positive deviation from Raoult's law is :One-line MCQ · Medium
Positive and Negative Deviations: every question and how it was framed
The chapter
Solutions in ten years of NEET
16 questions from 2017–2026, asked in 8 of 10 papers, about 1.6 a paper. Solutions and Colligative Properties alone had 16.