Question

Which of the following is true, if the transition of a system results in positive Gibbs free energy change?

(a) It is a spontaneous reaction

(b) Free energy of products is less

(c) It is a non-spontaneous reaction

(d) Free energy of reactants is more

This question was addressed to me in examination.

This is a very interesting question from Modern Theory Principles in section Modern Theory Principles of Corrosion Engineering

Answer 1

Correct option is (c) It is a non-spontaneous reaction

To explain: If the transition of a system from one state to another state resulted in positive free energy change then it is known as a non-spontaneous reaction. It means the free energy of reactants is less than the free energy of products. It requires external heat or force to proceeds with the reaction.