The correct option is D All of these
(A)4NH3+5O2Pt/Rh−−−−−−−→5 atm,850∘C4NO(g)+6H2O(g);
Principal reaction of Ostwald's method of HNO3 manufacturing.
(B) HNO2 is weak oxidising agent and oxidises Fe2+ to Fe3+, I− to I2 and is self reduced to N2O or NO. In contrary, HNO2 is oxidised by KMnO4 and Cl2 forming NO−3.
(C) 2NO2+O3⟶N2O5+O2