Which of the following is a heavy metal pollutant commonly found in industrial effluents?
Nitrate
Phosphate
Lead
Potassium
Heavy metals like lead, mercury, and cadmium are common pollutants found in industrial effluents. Nitrate and phosphate are common nutrient pollutants found in agricultural runoff, while potassium is a nutrient commonly found in fertilisers.
Note: The use of lead has been regulated by many countries, as it is a toxic pollutant that can cause neurological and developmental problems in humans and animals.