ABSTRACT: The study of liquid mixtures finds wide application in industrial and technological processes. In this work evaluated experimental densities (ρ) and ultrasonic velocities (U) for the pure liquids and liquid mixture of Chlorobenzene and p-Xylene using bicapillary pycnometer and single frequency variable path over the different concentration range at 298.15 K Temprature. The observed data had been utilized to calculate various acoustical parameters like Isentropic compressibility (KS), Intermolecular free length (Lf) and acoustic impedance (Z). Excess ultrasonic velocities (UE), Excess Isentropic compressibility (KSE), Excess Intermolecular free length (LfE) and Excess acoustic impedance (ZE) were calculated using the measured values and correlated with the Redlich–Kister polynomial equation. The observed variations of the properties for the above mixture conclude that the interactions between unlike molecules predominate over the dissociation effects in the individual comp

Keywords: Acoustic impedance, Density, Inter molecular free-Length, Isentropic Compressibility, Ultrasonic velocity.