Chapter 8, Problem 8.99P

Which solution in each pair has the higher melting point?
a. $\text{0}\text{.10 M NaOH or 0}\text{.10 M glucose}$
b. $\text{0}\text{.20 NaCl M or 0}{\text{.15 M CaCl}}_{\text{2}}$
c. $\text{0}{\text{.10 M Na}}_2{\text{SO}}_{\text{4}}\text{ or 0}{\text{.10 M Na}}_{\text{3}}{\text{PO}}_{\text{4}}$
d. 0.10 M glucose or 0.20 M glucose