Which statement is false? A. the vapor pressure of a solvent over a solution decreases as its mole fraction increases B. The solubility of a gas increases as the temperature decreases C. The vapor pressure of a solvent over a solution is less than that of a pure solvent D. The greater the pressure of a gas over a solution the greater its solubility E. Ionic solutes dissociate in a solution causing an enhancement of all colligative properties.