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Option 4
a) Pure Nitrogen
Sodium azide 
or Barium azide 
b) Haber process
Making ammonia
c) Contact process
producing sulphuric acid 
d) Deacon's process
Pruduces 
gas
Option 1)
(i) (ii) (iii) (iv)
Option 2)(ii) (iv) (i) (iii)
Option 3)(iii) (iv) (ii) (i)
Option 4)(iv) (iii) (ii) (i)