At a given temperature, which of the two aqueous solutions 1.0 M Na2SO4 or 1.0 M NaCl has the lower boiling point and freezing point
a) Na2SO4 has a lower boiling and freezing point.
b) NaCl has a lower boiling and freezing point.
c) Both solutions have the same boiling and freezing points.
d) The relationship depends on factors other than concentration.