Question

Name the process involved in the following reaction for preparation of H2SO4


2SO2 + O2 -----------------------------> 2SO3 + 2[NO]

[NO]

SO3 + H2O -----------------------------> H2SO4

Options

A) Chamber process

B) Contact process

C) Deacon’s process

D) Haber’s process

Answer 1

answer is (b) contact process

Answer 2

Option (B) is correct.
Contact Process:
it is the process which is used when sulphur trioxide (SO₃) is formed from sulphur dioxide (SO₂). The manufacture of SO₃ is an exothermic and reversible reaction. SO₃ formed is then used to manufacture concentrated sulphuric acid (H₂SO₄). 
Steps Involved in Manufacturing H₂SO₄ :
1. Burning of Sulphur:
S + O₂ → SO₂
2. Conversion of Sulphur dioxide into sulphur trioxide:
2SO₂ + O₂ ↔ 2 SO₃
3. Addition of concentrated sulphuric acid to form Oleum:
SO₃ + H₂SO₄ → H₂S₂O₇
4. Addition of Water:
H₂S₂O₇ + H₂O → 2 H₂SO₄