contact process

Question 1

step 1

Answer 1

sulphur is reacted with oxygen to form sulphur dioxide

S + O —–> SO2

Question 2

step 2

Answer 2

the sulphur dioxide is reacted with more oxygen to form sulphur trioxide

SO2 + O2 —–> S03

Question 3

step 3

Answer 3

the sulphur trioxide is absorbed in concentrated sulphuric acid to form oleum

H2SO4 + SO3 —-. H2S207

Question 4

STEP 4

Answer 4

the oleum is diluted with (the suitable amount) of water to form concentrated sulfuric acid

H222O7 + H2O —–> 2H2SO4

Question 5

uses of sulfuric acid

Answer 5

fertilizers

cleaning products

Question 6

uses of sulfur dioxide

Answer 6

preserve food
sterilising
making wine
refrigerant
fumigants
bleach for wood pulp