In an irreversible process taking place at constant T and P and in which only pressure-volume work is being done, the change in Gibbs free energy (dG) and change in entropy (dS), satisfy the criteria :

The correct relationship between free energy change in a reaction and the corresponding equilibrium constant K_c is :

The enthalpy change for a reaction does not depend upon :

The solubility in water of a sparingly soluble salt AB₂ is 1.0 $$\times$$ 10^-5 mol L^-1. Its solubility product number will be :