The main cause of water pollution is

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(B) Water pollution is primarily caused by the discharge of untreated or partially treated industrial waste into water bodies. Industrial effluents co

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Industrial effluents

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(B) Water pollution is primarily caused by the discharge of untreated or partially treated industrial waste into water bodies. Industrial effluents contain various toxic chemicals,heavy metals,and organic pollutants that severely degrade water quality and harm aquatic life. While soaps,smoke,and ammonia can contribute to pollution,industrial effluents represent the most significant and widespread source of large-scale water contamination.

Column-$I$	Column-$II$
$(P)$ Suspended solids	$(I)$ Fecal matter, bacteria, cloth and paper fibers
$(Q)$ Colloidal materials	$(II)$ Sand, silt, and clay
$(R)$ Dissolved materials	$(III)$ Nutrients (nitrate, ammonia, phosphate, sodium, calcium)

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