Solution:  When a nonvolatile solute is added to a volatile solvent, the solution vapor pressure, the boiling point ___________________ the freezing point__________ and the osmotic pressure across a semi permeable membrane _________________________. a) decreases, increases. decreases, increasesb) increases, increases, decreases, increasesc) increases, decreases, increases, decreasesd) decreases, decreases, increases, decreasese) decreases; increases. decreases. decreases