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 $ (dG) $ and change in entropy $ (dS) $ , satisfy the criteria

• A. $ {{(dS)}_{V,\,\,E}}<0,\,\,{{(dG)}_{T,\,\,P}}<0 $
• B. $ {{(dS)}_{V,\,\,E}}>0,\,\,{{(dG)}_{T,\,\,P}}<0 $
• C. $ {{(dS)}_{V,\,\,E}}=0,\,\,{{(dG)}_{T,\,\,P}}=0 $
• D. $ {{(dS)}_{V,\,\,E}}=0,\,\,{{(dG)}_{T,\,\,P}}>0 $

Answer 1

Answer: (B)

An irreversible process $ \Rightarrow $ spontaneous process $ \Rightarrow {{(dS)}_{VE}} $ (change in entropy) $ =+ve>0 $ $ \Rightarrow $ $ {{(dG)}_{T,\,\,P}} $ (change in Gibbs free energy) $ -ve\Rightarrow \,\,<0 $