Precipitation study was carried out in Ni-35 at. pct Cr alloy by measuring electrical resistivity at different ageingtemperatures and long ageing times. During ageing, it was observed that electrical resistivity initially rose withageing time and then fell after very long ageing at a constant temperature. The initial increase in resistivity duringageing may be attributed to the formation of GP zones/Cr-rich precipitates at early stages by nucleation process anddecrease in resistivity, and after attaining a maximum, is due to the growth of precipitate particles and subsequentlyby coarsening of these precipitates. The results of electrical resistivity measurements during ageing were confirmedby X-ray diffraction analysis indicating the formation of a Cr-rich phase and a Cr3Ni2 phase in the Ni matrix.