Question

Which of these statements is wrong ?

• A. In an exothermic reaction, $\Delta$H is negative and the enthaly decreases.
• B. In an endothermic reaction, $\Delta$H is positive and the enthalpy increases.
• C. In a reaction where $\Delta$G is negative, the forward reaction is spontaneous
• D. In a reaction where $\Delta$G is positive, $\Delta$S may also be positive
• E. In a reaction where $\Delta$H is positive and $\Delta$S is negative, the forward reaction is spontaneous

Answer 1

The correct option is E In a reaction where $\Delta$H is positive and $\Delta$S is negative, the forward reaction is spontaneous

In a reaction, where $\Delta H$ is positive and $\Delta S$ is negative, the forward reaction is non spontaneous.
$\Delta G=\Delta H-T\Delta S$
$\Delta H>0$ and $\Delta S<0$
$-T\Delta S>0$ so, $\Delta G>0$
Such a reaction is non spontaneous.