Applications of relation between gibbs free energy and EMF

Relation between EMF and Gibbs Free Energy

The correct relationship between Gibb's free energy change and the EMF of a cell is

What is the relationship between Gibbs free energy of the cell reaction in a galvanic cell and the emf of the cell ? When will the maximum work be obtained froma galvanic cell ?

Second application Determination of direction of reaction | Third Application Relation between vapour density and degree of dissociation

For the equilibrium reaction, the value of Gibbs free energy change is:

Which of the following can help to predict the rate of reaction if the standard Gibb's free energy of reaction (Delta_rG^@) is known ?