Question
Rain is called acid rain when its pH is below
Answer: Option D
:
D
Acid rain is a term referring to precipitation (rain, snow, sleet, fog, cloudwater, dew etc.) mixed with acidic components. Water has a neutral pH of 7. Liquids with a pH less than 7 are acidic, and those with a pH greater than 7 are alkaline. Unpolluted rain has an acidic pH, but usually no lower than 5.7, because carbon dioxide and water in the air react together to form carbonic acid, which is a weak acid. But the presence of pollutants such as oxides of sulphur and nitrogen cause further acidification of rainwater, by forming sulphuric acid and nitric acid, which further lower the pH of rainwater, making it acidic.
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:
D
Acid rain is a term referring to precipitation (rain, snow, sleet, fog, cloudwater, dew etc.) mixed with acidic components. Water has a neutral pH of 7. Liquids with a pH less than 7 are acidic, and those with a pH greater than 7 are alkaline. Unpolluted rain has an acidic pH, but usually no lower than 5.7, because carbon dioxide and water in the air react together to form carbonic acid, which is a weak acid. But the presence of pollutants such as oxides of sulphur and nitrogen cause further acidification of rainwater, by forming sulphuric acid and nitric acid, which further lower the pH of rainwater, making it acidic.
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