NO
N2O
NO2
N2O3
Answer is Right!
Answer is Wrong!
The correct answer is $\boxed{\text{B. }N_2O}$.
Laughing gas is a chemical compound with the formula $N_2O$. It is a colorless gas that is slightly sweet-smelling and has a slightly bitter taste. It is used as an anesthetic and as a recreational drug.
Option A, $\text{NO}$, is nitric oxide. It is a colorless, odorless gas that is a major component of air pollution. It is also a signaling molecule in the body.
Option C, $\text{NO2}$, is nitrogen dioxide. It is a reddish-brown gas that is a major component of smog. It is also a toxic gas that can cause respiratory problems.
Option D, $\text{N2O3}$, is dinitrogen trioxide. It is a blue-green solid that is a powerful oxidizer. It
is also a toxic gas that can cause respiratory problems.