JEE Main201910 Apr 2019Morning ShiftChemistryThermodynamics (C)Actual
A process will be spontaneous at all temperatures if:
Options
- A∆ H < 0 and ∆ S < 0
- B∆ H < 0 and ∆ S > 0
- C∆ H > 0 and ∆ S > 0
- D∆ H > 0 and ∆ S < 0
Correct answer
B. ∆ H < 0 and ∆ S > 0
Step-by-step solution
For a spontaneous process at all temperature Δ G should be less than zero at all temperature ∆ G < 0 ∆ G = ∆ H - T ∆ S ∆ H < 0 and ∆ S > 0 will make Δ G < 0 ; at all temperature.