Ncert Exercises & Solutions

Which of the following alternatives best describes the reaction A ⇌ B at its halfway point?

1. $∆ G^{⊝} = 0$

2. $∆ G^{⊝} > 0$

3. $∆ G^{⊝} < 0$

4. $∆ G^{⊝} = - RT \ln K$

Hint:

∆ G^{⊝} = - RT \ln K

As we know that,

∆ G^{⊝} = - RT \ln K

At the stage of half completion of the reaction,

A ⇌ B, [A] = [B]

Therefore,

K = 1

Thus,

∆ G^{⊝} = 0