Browse Questions
Thermodynamics

# S1: $\Delta G$ and $\Delta H$ of a reaction always have the same sign.  S2: $\Delta G_f^{\circ}$ of carbon(graphite) is equal to zero.

$\begin {array} {1 1} (A)\;\text{If both S1 & S2 are correct and S2 is correct explanation of S1.} \\ (B)\;\text{If both S2 & S1 are correct but S2 is not correct explanation of S1.} \\ (C)\;\text{If S1 is correct but S2 is wrong.} \\ (D)\; \text{If S1 is wrong but S2 is correct.} \end {array}$

$\Delta G = \Delta H – T \Delta S$. So. if $\Delta H < T\Delta S, \Delta G > 0,$ then $\Delta H < 0$, i.e, both will have different signs.
Ans : (D)