state gov TSPSC Group 3 (తెలంగాణ గ్రూప్ 3) 2023 Mock Test Series General Knowledge Ecology and Environment Conservation efforts: India and World
Identify the Environmental friendly method among the following:
1
Usage of poly chlorinated biphenyls as cleansing solvent
2
Usage of chlorine for bleaching paper
3
Usage of tetra chloro ethane for dry cleaning
4
Usage of H2O2 for bleaching cloths.