The contact process is used for the industrial production of

Explanation

The contact process is a series of chemical reactions that produce sulfuric acid on a large scale. Factories use this method to make millions of tons of sulfuric acid each year.

The process starts by burning sulfur to make sulfur dioxide gas. Then sulfur dioxide reacts with oxygen on a catalyst surface to form sulfur trioxide, which combines with water to produce sulfuric acid.

Sulfuric acid is one of the most important industrial chemicals used in making fertilizers, batteries, and many other products. The contact process is the main commercial method for producing it.