The chemical formula of oleum is: MCQ with Answer and Explanation

Explanation:
Eutrophication is the excessive richness of nutrients (mainly nitrates and phosphates from fertilizers and sewage) in a lake or other body of water. This causes a dense growth of plant life (algal blooms) and depletion of oxygen, killing aquatic animals and disrupting the ecosystem.

Explanation:
Teflon is polytetrafluoroethylene (PTFE), a fluorocarbon polymer with extremely low coefficient of friction and high thermal stability, making it ideal for non-stick cookware. PVC (polyvinyl chloride) is used in pipes and cables. Polystyrene is used in packaging and insulation. Nylon is a polyamide used in textiles. Teflon is chemically inert and resistant to acids and bases.

Explanation:
Zinc (Zn) is a micronutrient required in small amounts for plant growth, enzyme activation, and chlorophyll synthesis. Nitrogen, phosphorus, potassium are macronutrients (primary). Micronutrients: Fe, Mn, Zn, Cu, B, Mo, Cl. Deficiency of Zn causes stunted growth and chlorosis. Fertilizers often include micronutrients.