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Question 800008
JEE Chemistry · Medium

Chemical Thermodynamics and Thermochemistry: Gibbs energy MCQ

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Gibbs energyMediumQuestion 800008

Question

The Gibbs free energy G = H − TS. A process is spontaneous when:
  1. A
    ΔG < 0
    Correct
  2. B
    ΔG > 0
  3. C
    ΔG = 0
  4. D
    ΔH < 0 always

Correct answer

ΔG < 0

Explanation

ΔG = ΔH − TΔS. Spontaneous: ΔG < 0. Equilibrium: ΔG = 0. Non-spontaneous: ΔG > 0. At constant T and P, ΔG < 0 is the criterion for spontaneity.

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