Nitrogen and its Compounds — Prelims Questions

Which of the following statements regarding the Haber process for ammonia synthesis is INCORRECT?

Which of the following oxides of nitrogen is paramagnetic and colorless in its gaseous state, but turns reddish-brown upon exposure to air?

In the Ostwald process for the manufacture of nitric acid, the first step involves the catalytic oxidation of ammonia. What are the optimal conditions for this step?

Which of the following reactions correctly represents the formation of dinitrogen ($N_2$) in the laboratory?

What is the oxidation state of nitrogen in $N_2O_3$ and $HNO_3$, respectively?

Which of the following statements about ammonia ($NH_3$) is INCORRECT?