Which of these processes is used for the industrial production of sulphuric acid?
Industrial production of sulphuric acid is done by a process called contact process. In this process, sulphuric acid is produced from sulphur, oxygen and water in four stages.
First, sulphur is burnt in oxygen to produce sulphur dioxide.
Second, the SO2 thus formed is allowed to combine with oxygen at a high temperature in the presence of vanadium pentoxide as catalyst to produce sulphur trioxide.
Third, the SO3 is now dissolved in concentrated sulphuric acid to form oleum.
Fourth, sulphuric acid is produced by mixing oleum with water.
This is how sulphuric acid is produced through the contact process.