- Sulfur dioxide is released during combustion of fossil fuels that contain sulfur impurities (coal) - sulfur in fuel becomes oxidised
- Nitrogen oxides are created from a reaction between nitrogen and oxygen in air, caused by the heat of burning - happens in internal combustion engines of cars
- When gases mix with water in clouds they form dilute sulfuric acid and dilute nitric acid, which falls as acid rain
- Acid rain kills plants and damages buildings and statues
- Acid rain also corrodes metal
- Sulfur dioxide and nitrogen oxides can be bad for human health and cause respiratory problems
- Test for sulfur impurities in a fuel by bubbling combustion gases through a universal indicator solution - if sulfur is present, the gases will contain sulfur dioxide and form sulfuric acid, which will turn the indicator red
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