Two procedures are given. 1. Sulfur is burnt in excess oxygen, and then NO is added to the mixture of products. 2. Sulfur is burnt in excess oxygen, and then $\text{NO}_2$ is added to the mixture of products. Which of these procedures will result in some sulfur trioxide, $\text{SO}_3$?
- Aboth 1 and 2
- B1 only
- C2 only
- Dneither 1 nor 2