Assessment and Qualifications Alliance (AQA) GCSE Chemistry Paper 2 Practice Exam

The gas produced by the reaction of sulfur with oxygen is sulfur dioxide. This occurs during the combustion of fossil fuels that contain sulfur. When sulfur is burned in oxygen, it combines chemically to form sulfur dioxide (SO₂), which is a colorless gas with a pungent smell.

This reaction is significant because sulfur dioxide can contribute to air pollution and the formation of acid rain, which can have harmful effects on the environment and human health. Therefore, understanding the combustion process and its byproducts is essential in chemistry, particularly in discussions around energy production and environmental impact.

The other gases listed are not produced in this specific reaction. Carbon dioxide is a product of the combustion of carbon-based fuels but does not involve sulfur. Ozone is a different molecule found in the atmosphere and is not formed from the sulfur-oxygen reaction. Methane, a hydrocarbon gas, is produced from organic materials and is not related to the combustion of sulfur in fuels.