Question

Which one of the following statements is false?
a. The heats of hydration of cations decrease as their
charge-to-radius ratios increase
b. The effects of lattice energies and solvation energies oppose each other in the dissolution of solids in liquids
c. The separation of solute particles from a crystal requires energy
d. All ions are hydrated in aqueous solution
e. Most solids that are water-soluble dissolve endothermically.