Assertion All reversible reaction proceeds in direction of lower Gibbs' energy.
Reson Reversible reaction proceeds spontaneously towards a state of equilibrium where the Gibbs' energy is minimum

Relation Between Reaction Quotient And Gibbs Free Energy

For a redox reaction to proceed spontaneously in a given direction, the emf should:

Assertion : At constant temperature and pressure chemical reactions are spontaneous in the direction of decreasing Gibb's energy Reason : For every chemical reaction at equilibrium standard Gibb's energy of the reaction is zero

A chemical process always proceeds in the direction in which the Gibbs free energy of the system decreases.