(a) With the help of chemical equations explain the principle of contact process in brief for the manufacture of sulphuric acid. (No diagram)
(b) Account for the following :
(i) Bond dissociation energy of is less than that of
(ii) Nitric oxide (NO) becomes brown when released in air.
(a) Principle of contact process : The process involves the oxidation of sulphur dioxide by air in the presence of a catalyst.
Sulphur trioxide is dissolved in 98% acid and oleum is formed
Oleum is diluted with water to form sulphuric acid
(b) (i) The low bond dissociation energy of F is due to high inter electronic repulsions between non-bonding electrons in 2p-orbitals as the size of F atoms is small. As a result, F-F bond is weaker than Cl-Cl bond.
(ii) It readily combines with to form brown fumes of