2023 · Q47
The effluents of which among the following industries are considered to be the main cause for lowering the pH value of river water?
General ScienceChemistry
- AAlcohol distillery industries
- BPlastic cup manufacturing industries
- CSoap and detergent industries
- DLead battery manufacturing industries
Explanation
Lead-acid battery manufacturing discharges spent sulphuric acid effluent, which sharply lowers the pH of receiving river water. Distillery spent wash is acidic too, but its defining pollution load is organic (very high BOD), while soap and detergent effluents are alkaline and raise pH. The keyed pH-lowering source here is the battery industry. Hence D.