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GATE 2021 MT – Question 39

Metallurgical Thermodynamics · Phase equilibria and phase diagrams · 2 marks · Multiple choice

The number of degrees of freedom for $M(s)+CO_2(g)\rightleftharpoons MO(s)+CO(g)$ is ______.

  1. 0
  2. 1
  3. 2
  4. 3

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Show answer and explanation

Correct answer: (C) 2

Explanation

Four species with one independent reaction give C=4−1=3 components. There are three phases: metal solid, oxide solid and one gas phase. Gibbs phase rule F=C−P+2=3−3+2=**2, C**.