Question

Select the correct statement.

• A. Ostwald's method of preparation of HNO3 is based upon catalytic oxidation of NH3 by atmospheric oxygen.
• B. HNO2 acts as both oxidising and reducing agents.
• C. NO2 reacts with O3 to form N2O5.
• D. All of these.

Answer 1

Answer: (D)

All of these.

Answer 2

(1) 4NH3 + 5O2 $\underset{5atm,850^{0}C}{\overset{\quad Pt/Rh\quad}{\rightarrow}}$4NO (g) + 6H2O (g) ; principal reaction of Ostwald's method of HNO3 manufacturing.

(2) HNO2 is weak oxidising agent and oxidises Fe2+ to Fe3+ and I- to I2 and it self reduced to N2O or NO. In contrary HNO2 is oxidised by KMnO4 and Cl2 forming NO3–.

(3) 2NO2 + O3 $\longrightarrow$ N2O5 + O2