Which of the following is an example of irritant gases (acid gases)?

Irritant gases, often referred to as acid gases, are substances that can cause irritation to the respiratory system, eyes, and skin upon exposure. The correct answer highlights a group of gases that are known for their acidic properties and irritant effects.

Hydrochloric acid (HCl), hydrofluoric acid (HF), and hydrobromic acid (HBr) are all strong acids that can generate harmful fumes when released into the atmosphere. When inhaled, they can lead to significant irritation or damage to the respiratory tract, and they can also produce immediate effects on mucous membranes. This is a defining characteristic of irritant gases.

In contrast, the other options include gases that either do not have acidic properties or are inert. For example, ammonia (NH3) is indeed an irritant but is not classified as an acid gas like the ones in the correct answer. Chlorine (Cl2) and sulfur dioxide (SO2) are also irritants but do not fit the definition of acid gases in the same context as HCl, HF, and HBr. Additionally, the presence of gases like carbon dioxide (CO2), nitrogen (N2), oxygen (O2), and hydrocarbons (C3H8 and