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GATE 2025 Chemical Engineering, Q15 · Thermodynamics

The correct answer is C, 2.

Question

The number of independent intensive variables that need to be specified to determine the thermodynamic state of a ternary mixture at vapor-liquid-liquid equilibrium is

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Official answer: 2

Why

GATE 2025 official key: (C). Gibbs phase rule: F = C − P + 2 = 3 − 3 + 2 = 2 (ternary mixture, C=3; three coexisting phases, P=3).

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

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