The solute-cosolute interaction of uracil by gallic acid has been studied through physicochemical investigation in aqueous environment. Here, we have carried out the density (ρ) and viscosity (η) measurements of uracil in w1= 0.001, 0.002 and 0.003 mass fraction of aqueous gallic acid binary mixtures at T= 298.15 K, 303.15 K and 308.15 K at pressure 1.013 bar. Some important parameters have been derived from the above physicochemical method, namely, limiting apparent molar volume (φ_V⁰) and viscosity B-coefficients using extended Masson equation and Jones-Dole equation respectively. The refractive index (n_D) has been done on the same system at T=298.15 K. Lorentz-Lorenz equation has used to evaluate molar refractive index (R_M) and limiting molar index (R_M⁰). The NMR study used to measure the plausible selective site of solute-cosolute interaction.