Question

describe the contact process of sulphuric acid

Answer 1

Let me explain you nicely ---
Firstly
SO2 is prepared by S+O2 gives SO2
Now
SO2 +O2 gives SO3 in presence of catalyst V2O5 and temp Up to 250degree celcius
Now
SO3 is added to H2SO4 which on reacting gives Oleum or H2S2O7 (pyrosulphuric acid)
Now
Oleum is reacted with water
H2S2O7+ H2O gives 2 (H2SO4) + H2O
In this way sulphuric acid is prepared
In industry

Answer 2

Contact process, modern industrial method of producing sulfuric acid; it has largely replaced the chamber, or lead-chamber, process. ... Sulfur dioxide and oxygen, passed over a hot catalyst, unite to form sulfur trioxide, which in turn combines with water to make sulfuric acid.