The mixing properties of the liquid alloys In-Pb and In-Mg have been investigated at temperatures of 873K and 900K, respectively, using a theoretical model that takes into consideration the formation of complexes in the liquid alloys. The energetics obtained from the study was used to determine the concentration-concentration fluctuation at the long wavelength limit S cc (0), the mutual diffusivities, surface tension and surface concentration for the alloys throughout the concentration range. Our studies indicate that in the In-Pb liquid alloy a low level of order is expected above 0.8 atomic fraction of indium while In-Mg is ordered throughout the concentration range with the intermetallic compounds formed in the solid phase persisting into the liquid phase of the alloy.