Question

Write the structure of A, B, C, D and E in the following sequence of reactions :
NH₃ + O₂  →A + H₂O
A + O₂  → B (Brown fumes)
B + H₂O  → C + A (C is an oxoacid)
C + I → D (Violet vapours)
Complete the reactions of the above mentioned sequence and name the process by which ‘C’ is obtained.

Answer 1

A is NO and Ostwald process for the manufacture of HNO3.
2NO + O₂ → 2NO₂
(A)
3NO₂ + H₂O → 2HNO₃ + NO
(B)                          (C)

  6I- + 2NO_3- + 8H+ → 3I₂ + 2NO + 4H₂O