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Rainwater is called acid rain when its pH falls below which value?

Answer and explanation

Correct answer: 5.6

Rainwater naturally dissolves some carbon dioxide, so ordinary rain is slightly acidic and commonly has a pH near 5.6. It is classified as acid rain when its pH falls below about 5.6, usually because sulfur dioxide and nitrogen oxides form stronger acids in the atmosphere. Such rain can harm aquatic life, soil, plants, and buildings. Hence option A is correct; 7 is neutral, while 8.5 and 10 are alkaline values.

Related tags

Acid RainPhAir PollutionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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