7.21 Describe the manufacture of by contact process?
Sulphuric acid is manufactured by the Contact Process that involves three steps:
(i) burning of sulphide ores or sulphur in the air to generate.
(ii) conversion of to by the reaction with oxygen in the presence of a catalyst ( ), and
(iii) absorption of in to give Oleum ()
Diluting the oleum with water gives of the desired concentration.