Cation distribution, structure analysis, elastic moduli, magnetic and dielectric features obtained by the citrate combustion technique of Co 0.8 Zn 0.2 Cr x Fe 2-x O (x ¼ 0, 0.02, 0.04, 0.06, 0.08 and 0.1) (CZC) nanoferrites were investigated. The most intense (311) peak is found to gradually shift towards higher diffraction angles, and so the lattice constant is found to decrease (from 8.3893 to 8.3698 Å, experimentally) and (from 8.3893 to 8.3853 Å, theoretically), as the Cr 4 3þ content increase. The crystallite size of CZC nanoferrites initially increases from 38 to 42 nm for Cr 3þ content (x ¼ 0.0 to x ¼ 0.06), and then decrease from x ¼ 0.08 onwards. Morphological contemplation (FE-SEM, HRTEM) manifests that the porosity diminishes significantly with increasing Cr 3þ content meanwhile the particles have some agglomeration. The elastic moduli and Poisson's ratio of CZC ferrite samples were determined, theoretically and experimentally, and then corrected to zero porosity using Hosselman and Fulrath's model. An analogous behavior for experimental and theoretical magnetic moment is obtained, attached with an increment attitude of YafeteKittel angle on the B-sublattice, which increase (from 39 )as the Cr 3þ content increase. The value of impedance is increased (from 44 k U to 203 k U) with increasing Cr 3þ content. Nyquist plot shows a single semicircle declaring that the predominant conduction is through the grain boundary volume. These results behold that substitution with Cr ions and porosity has prominent impacts on the various properties of Co-Zn nanoferrites, making it nominee for multilateral applications. The loss of Co 0.8 Zn 0.2 Cr 0.1 Fe 1.9 O nanoferrite (x ¼ 0.1) is decreased ~ 4 times with increasing relaxation time from 0.53 to 15.9 ms, which has good predictions for next generation cores of RF transformers.