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Acid rain occurs when human-generated pollutants mix with water during which stages of the water cycle?

Answer and explanation

Correct answer: Condensation and precipitation

Correct answer: B. Burning coal, oil and other fuels can release sulfur dioxide and nitrogen oxides into the atmosphere. These gases may react with oxygen and water in atmospheric droplets to produce sulfuric, sulfurous or nitric acids. During condensation, water vapour forms cloud droplets and pollutants can dissolve or react in them. The acidic droplets may then fall as precipitation, including rain, snow or mist. A is not the best answer because evaporation changes liquid water into vapour; it is not the main stage at which acid rain is formed. C and D occur mainly after water reaches the ground, whereas acid formation generally occurs in the atmosphere before precipitation. Memory cue: pollution plus cloud water, followed by precipitation, produces acid rain.

Related tags

Acid-RainAir-PollutionCondensationPrecipitationHydrological CycleThe Living WorldBiologyClass 11 Mcq

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