The GATE Grind

GATE 2024 MT – Question 29

Metallurgical Thermodynamics · Thermodynamic laws and functions · 1 mark · Multiple select

Which of the following is/are criterion/criteria for equilibrium of an isolated system held at constant temperature and constant pressure?

  1. Entropy maximization
  2. Entropy minimization
  3. Maximization of Gibbs free energy
  4. Minimization of Gibbs free energy

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Show answer and explanation

Correct answer: (A) Entropy maximization; (D) Minimization of Gibbs free energy

Explanation

An isolated total system reaches equilibrium by maximizing total entropy.

For a system constrained to fixed temperature and pressure, the equivalent potential criterion is minimization of Gibbs free energy.

These standard criteria correspond to **A,D**.

The wording combines distinct constraint descriptions; the final-key combination is retained.