Zinc chromite nanoparticles (NPs) and zinc chromite-reduced graphene oxide (ZnCr 2 O 4 -rGO) nanocomposite have been synthesized by the combined effect of re ux condensation and calcination process. The structural properties were characterised by X-ray diffraction (XRD), Fourier transform infrared (FTIR), UV-visible studies etc. Structural morphology was investigated by eld emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) that indicates the formation of particles in nanometre regime. The catalytic effects of synthesized materials were studied in presence of visible light assisted by hydrogen peroxide (H 2 O 2 ) and they show excellent photo activity which supports the band gap value and photoluminescence outcome. The presence of the elements Zn, Cr, O and C has been con rmed by Energy dispersive X-ray spectroscopy (EDX) images which show the purity of the synthesized products.