What are the properties of sulphur oxides?

Sulphur oxides are inorganic compounds, typically gases, that are highly reactive and have a strong, pungent smell.

Sulphur oxides are a group of compounds formed by the combination of sulphur and oxygen. The most common types are sulphur dioxide (SO2) and sulphur trioxide (SO3). These are typically gases at room temperature and are known for their strong, pungent smell. They are inorganic compounds, meaning they do not contain carbon.

Sulphur dioxide is a colourless gas with a strong, choking smell. It is soluble in water and alcohol. When dissolved in water, it forms a weak acid known as sulphurous acid (H2SO3). It is a reducing agent and can be oxidised to sulphur trioxide. It is used in the preservation of dried fruits and in winemaking, as it prevents bacterial growth and oxidation.

Sulphur trioxide, on the other hand, is a colourless to white crystalline solid that melts and boils easily. It reacts violently with water to form sulphuric acid (H2SO4), which is a strong acid and a powerful dehydrating agent. It is used in the production of sulphuric acid, which is one of the most widely used chemicals in the world.

Both sulphur dioxide and sulphur trioxide are highly reactive. They can cause harm to the environment and living organisms. When released into the atmosphere, they can react with water vapour to form acid rain, which can damage buildings, harm vegetation and aquatic life, and cause respiratory problems in humans and animals.

In terms of their chemical properties, sulphur oxides are generally acidic. They can react with bases to form salts. They also act as oxidising or reducing agents, depending on the specific reaction. For example, sulphur dioxide can be oxidised to sulphur trioxide, while sulphur trioxide can be reduced to sulphur dioxide.