Herein, we report a single phase equi-atiomic high-entropy oxide (HEO) of a new composition (Mn_0⋅2Fe_0⋅2Co_0⋅2Ni_0⋅2Zr_0.2)₃O₄ with spinel structure. The material was synthesized via microwave energy irradiated co-precipitation technique and a subsequent calcination at 500 °C. The X-ray diffraction and selected area electron diffraction assisted in the crystal phase determination. While the STEM-EDS elemental mapping was used to realize the chemical  homogeneity and elemental distribution. The synchrotron X-ray absorption spectroscopy aided to determine the ionic states of constituents and their distribution over the octahedral (O_h) and tetrahedral (T_d) co-ordination environment. It displayed ferrimagnetic nature with a magnetization of ~12 emu/g at an applied field of 90 kOe. Intriguingly, the synthesized material performed well as a catalyst in the Fenton degradation of Tetracycline  micropollutant. The degradation behaviour followed a zero-order kinetic and the rate constant is calculated as 0.43 mol L^-1s^-1.