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What role do sulphur dioxide and nitrogen oxides play in acid rain?

Answer and explanation

Correct answer: They can combine with water to form acids

Sulphur dioxide and nitrogen oxides are acidic pollutants released mainly by combustion and industrial processes. In the atmosphere, they undergo oxidation and react with water to form acids such as sulphuric acid, sulphurous acid, nitric acid, or nitrous acid. These reactions increase hydrogen-ion concentration and lower the pH of rainwater. They do not make rain basic or merely change its colour. Therefore, option A correctly explains acid rain.

Related tags

Acid-RainSulphur-DioxideNitrogen-OxidesEnvironmentAcids-Bases-SaltsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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