:The densities (ρ) and ultrasonic velocities (C) of binary mixture of diisopropyl ether (DIPE) and bromobenzene (BB) have been measured at different frequencies (1 MHz, 3 MHz and 5 MHz) over the entire range of mole fraction of diisopropyl ether (DIPE) at temperature 303 K. The intermolecular free length (L f ), isentropic compressibility (β), acoustic impedance (Z) and excess values of isentropic compressibility (β E ) and acoustic impedance (Z E ) have been computed using values of ultrasonic velocity (C) and density (ρ).The ultrasonic velocity, intermolecular free length are positive whereas the excess values of isentropic compressibility and acoustic impedance are negative over the entire composition range of DIPE which indicates presence of specific interactions between unlike molecules. The results are discussed in the light of intermolecular interactions occurring in the mixtures.

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The densities ( ) and ultrasonic velocities (C) of binary mixtures of a polar liquid like acetone and toluene have been measured at different frequencies (lMHz, 3MHz and 5MHz) over the entire range of mole fraction of acetone at temperature 303.16k. The intermolecular free length (L f ), isentropic compressibility ( ), acoustic impedance (Z), excess values of isentropic compressibility ( ) and acoustic impedance (Z E ) have been computed using values of ultrasonic velocity (C) and density ( ). The ultrasonic velocity (C), intermolecular free length (L f ) and excess values of isentropic compressibility are positive whereas excess values of acoustic impedance is negative for the entire composition range which indicates the specific interaction between unlike molecules. The results are discussed in the light of intermolecular interactions occurring in the solutions.

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