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According to Raoult's law, 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 pure solvent.
d. The greater the pressure of a gas over a solution the greater its solubility.
e. Ionic solutes dissociate in solution causing an enhancement of all colligative properties.

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