Sulfur dioxide (SO2), along with nitrogen oxides (NOx), is the main cause of acid rain. When these gases are released into the atmosphere from factories and power plants, they react with water, oxygen and other chemicals to form sulfuric and nitric acids. These then mix with water before falling to the ground as precipitation. ANSWER: (C) Sulfur dioxide
Which gas is primarily responsible for ‘Acid Rain’? (A) Nitrogen (B) Argon (C) Sulfur dioxide (D) Helium
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Acid rain forms when primary pollutants like sulfur dioxide are chemically transformed in the atmosphere. Normal rainwater is slightly acidic (pH of about 5.6), but acid rain can have a pH as low as 4.0 or even less. This acidic precipitation leaches aluminum from soil, which is toxic to plants and fish and it can dissolve minerals in statues and buildings made of limestone or marble. While sulfur dioxide from coal-burning is the biggest contributor, nitrogen oxides from vehicle exhaust also play a major role. International regulations have significantly reduced these emissions in recent decades to protect global ecosystems.
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