Ncert Exercises & Solutions

Which of the following is not correct?

1. $∆ G$ is zero for a reversible reaction.

2. $∆ G$ is positive for a spontaneous reaction.

3. $∆ G$ is negative for a spontaneous reaction.

4. $∆ G$ is positive for a non-spontaneous reaction.

Hint: For spontaneous reaction

∆ G

value is negative

∆ G

gives criteria for spontaneity at constant pressure and temperature.

(i) If

∆ G

is negative (<0), the process is spontaneous.

(ii) If

∆ G

is positive (>0), the process is non-spontaneous

(iii) If

∆ G

is zero then the reaction is equilibrium.

Here, option second is the correct answer