Which one of the following statements about physical equilibrium is incorrect ?

At atmospheric pressure the temperature at which the solid and liquid phases are at equilibrium is called normal freezing point of the substance.

At 273 K and 1 atm pressure, ice and water are at equilibrium with each other

At room conditions, water in an open vessel is in equilibrium with water vapour.

In saturated solution, a dynamic equilibrium exist between the solute molecules in the solid state and in the solution.