The molten Mg-Zn alloy has been treated as a single-component system within the framework of the Ashcroft pseudopotential formalism and to evaluate the pair potential. The effective core radius was calculated using the concept of Wigner Seitz’s sphere. The longitudinal and transverse phonon frequencies were evaluated using the derived pair potential in the random phase approximation. Dynamic variables, namely, velocity autocorrelation function and power spectrum, have also been calculated, through the use of the theory of Glass and Rice in static harmonic approximation.