Question

In an irreversible process taking place at constant T and P and in which only pressure-volume work is being done the change in Gibbs free energy $\left(\Delta G\right)$ and change in entropy $\left(\Delta S\right)$ satisfy the criteria:

• A. $\left(\Delta S\right)=0,\left(\Delta G\right)=0$
• B. $\left(\Delta S\right)<0,\left(\Delta G\right)=0$
• C. $\left(\Delta S\right)<0,\left(\Delta G\right)<0$
• D. $\left(\Delta S\right)>0,\left(\Delta G\right)>0$

Answer 1

Answer: (C)

$\left(\Delta S\right)<0,\left(\Delta G\right)<0$

In a irreversible process

$⟶$ it is a spontaneous process. [D]

So, $△S>0\Rightarrow +ve$

$△G<0\Rightarrow -ve$