For a process occurring at constant temperature and pressure,which of the following is true at equilibrium?

The $\Delta G$ in the process of melting of ice at $-15\,^{\circ}C$ is

$A$ chemical reaction cannot occur at all if

What is the value of $\Delta G$ for a water system in an environment with a temperature of $100 \ K$?

Which of the following processes will never be a spontaneous process?

Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However,the reaction is spontaneous at the boiling point of water. Choose the correct option.