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The ultrasonic velocity(u),density(ρ)and viscosity(η) have been measured in binary liquid mixtures containing n-hexane with tetrahydrofuran. From these data some of acoustical parameters such as adiabatic compressibility (βad), free length(Lf), free volume(Vf), internal pressure(πi), relaxation time(τ) and Rao’s constant(R) have been calculated using the standard relations.The related excess thermodynamic parameters are also evaluated by using standard relations and weighing individual component properties to calculate ideal behaviour. Theoretical results are compared with observed data based on the use of mole fraction of individual component properties. These values are used to discuss the existence of molecular interaction between the constituents of binary liquid mixture. The variation of these parameters with concentration and temperature are also used to correlate with the structural changes observed in binary liquid mixture. The result suggest that a specific weak inter molecular interactions at a particular concentration in binary liquid mixture. The observed values of thermo-acoustic and excess parameters indicate the strong molecular interaction at specific mole fraction of constituents of binary liquid mixture. There is a good agreement between theoretical and experimentally observed results. The present paper represents the non linear variation of ultrasonic velocity and thermo-acoustical parameters lead to increased dipole-induced dipole interaction between solute and solvent molecules.The result is interpreted in terms of molecular interaction such as dipole-induced dipole interaction, molecular association between components of mixtures.
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