Paper: CSIR-NET June 2011 · Subject: Physical Chemistry · Chapter: Gaseous State · Topic: Gaseous State – General · Marks: 2 · Difficulty: Medium
Under review — part of this question (a structure or an option) is not clear in the source scan. 4AB is checking it against the original book; the answer shown may change.
An ideal gas expands by following an equation $\mathrm{PV}^{\mathrm{a}}=$ constant. In which case does one expect heating?
(a)$3 > a > 2$
(b)$2 > a > 1$
(c)$0 < a < 1$
(d)$-1 < a < 0$
Answer
Under review — not yet confirmed.
Answer: C
Explanation
For PVᵃ = constant, T ∝ PV ∝ V^(1−a). On expansion T rises only when a < 1; among the options with a positive exponent that is 0 < a < 1 (a = 1 is isothermal, a = γ adiabatic cooling).