The activity of Cd in liquid Ga-Cd alloys in the 723-851 K range was determined by an electrochemical technique using LiCl-KCl + 5 wt.% CdCl2 as molten salt electrolyte. The system exhibits a strong positive deviation from Raoult's law. From the activity values computed at different temperatures, the partial, integral, and excess molar thermodynamic quantities have been calculated. The composition dependence of the cu-function confirms that the system does not follow a regular solution model. The analysis of Darken's stability function reiterates that though the stability is positive for all compositions, it is poor in the 0.25 less than or equal to x(Cd) less than or equal to 0.45 composition range. This shows a tendency for immiscibility in this composition range.