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Acid rain is generally considered to have pH below which value?

Answer and explanation

Correct answer: 5.6

The governing concept is the pH scale and the natural acidity of rainwater. Unpolluted rain is mildly acidic, with pH about 5.6, mainly because atmospheric carbon dioxide dissolves in water to form weak carbonic acid. Rain with pH below approximately 5.6 is commonly classified as acid rain, often due to stronger acids formed from sulfur and nitrogen oxides. Values 7, 10, and 14 do not represent this threshold, so option A is correct.

Related tags

Acid RainPh ScaleAtmospheric PollutionEnvironmental ChemistryAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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