${\mathrm{CaCl}}_2,6{\mathrm{H}}_2\mathrm{O},{\mathrm{SrCl}}_2\cdot 6{\mathrm{H}}_2\mathrm{O}\text{ and }{\mathrm{BaCl}}_2\cdot 2{\mathrm{H}}_2\mathrm{O}$ lose H₂O  molecules on heating. The anhydrous salts become wet when kept in air. These facts indicates that these anhydrous halides
I) can act as drying agents
II) as cation size increases the tendency to get hydrated decreases
III) can absorb moisture from air