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Thermodynamics · JEE Preparation Chemistry

Which of the following conditions is always true for a spontaneous reaction at all temperatures?

Practice question from Thermodynamics (JEE Preparation Chemistry), with the correct answer and a step-by-step solution.

easy · MCQ · Q-646ED5

Which of the following conditions is always true for a spontaneous reaction at all temperatures?

  1. A.ΔH<0,ΔS<0\Delta H < 0, \Delta S < 0
  2. B.ΔH>0,ΔS>0\Delta H > 0, \Delta S > 0
  3. C.ΔH<0,ΔS>0\Delta H < 0, \Delta S > 0Correct answer
  4. D.ΔH>0,ΔS<0\Delta H > 0, \Delta S < 0

Solution

For a reaction to be spontaneous at all temperatures, the Gibbs free energy change (ΔG=ΔH−TΔS\Delta G = \Delta H - T\Delta S) must be negative at any temperature. This requires ΔH<0\Delta H < 0 (exothermic) and ΔS>0\Delta S > 0 (increase in disorder).

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