36. Oxide of sulphur present in the atmosphere are washed down by rains to cause : A.Depletion of fossil fuel reserves B.Eutrophication in lakes C.Lowering of pH of soil D.Industrial smog formation
Answer: Option A Solution: The oxide of Sulphur (Sulphur Dioxide) is washed down on earth as acid rain. It makes the soil acidic by lowering its pH; this affects plants and animals adversely. Acid rain contains H+, SO42- ions which when added to the soil leaches the nutrients from the soil. Acid rain renders the river or even ocean water acidic, thereby affecting marine animals adversely. Changes in pH of fresh water affect the reproduction and survival or many species or fish.
