JEE PYQ: Thermodynamics Question 25
Question 25 - 2019 (10 Apr Shift 1)
A process will be spontaneous at all temperatures if:
(1) $\Delta H < 0$ and $\Delta S < 0$
(2) $\Delta H > 0$ and $\Delta S < 0$
(3) $\Delta H < 0$ and $\Delta S > 0$
(4) $\Delta H > 0$ and $\Delta S > 0$
Show Answer
Answer: (3)
Solution
A reaction is spontaneous if $\Delta G_{sys}$ is negative. $\Delta G_{sys} = \Delta H_{sys} - T\Delta S_{sys}$. A reaction will be spontaneous at all temperatures if $\Delta H_{sys}$ is negative and $\Delta S_{sys}$ is positive.
BETA
