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GATE 2026 Chemical Engineering, Q15 · Thermodynamics

The correct answer is A, 0.

Question

Consider a closed system of one mole of an ideal gas undergoing a polytropic process. The process follows PVn=PVⁿ = constant, where P is the pressure, V is the volume and n is a constant. If the process is isobaric, which one of the following is the value of n?

  • A. 0
  • B. 1
  • C. ∞\infty
  • D. the ratio of specific heat capacity at constant pressure to specific heat capacity at constant volume

Official answer: 0

Why

GATE 2026 official key: (A). For PVn=PVⁿ = constant, an isobaric (constant-P) process requires n = 0, since P⋅V0=P\cdot V⁰ = P = constant.

Explanation cross-checked for consistency. Final answer matches the official IIT answer key.

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