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Zinc oxide nanoparticles were synthesized by sol-gel method using zinc chloride / zinc acetate dihydrate / zinc nitrate hexahydrate and Sodium Hydroxide as precursors. The XRD patterns ZnO nanoparticles reveal the formation of well-crystalline single phase materials and all ZnO nanoparticles possess hexagonal structure.The lattice parameters were calculated from 2θ values in the X-ray diffraction patterns by using Fullprof program computer programming. From the results, the unit cell parameters (Å), unit cell volume (Å3) and density (g/cm3) of ZnO were found to be almost same for various precursor used for synthesis. This confirms, the lattice parameters of the oxides do not depend on the precursor composition. The synthesized ZnO nanoparticles have been characterized by X-ray diffraction (XRD), UV-Visible spectroscopy, VSM studies.