Question 27

The Correct Answer is A ### 1. Explanation for Option A (carbon dioxide gas) **Carbon dioxide ($\text{CO}_2$) gas** is the correct answer because it is a common component of the inflation gas used in many emergency liferafts (often mixed with nitrogen). When the liferaft is deployed and inflated, a large amount of compressed $\text{CO}_2$ quickly fills the buoyancy tubes. While necessary for rapid inflation, the released $\text{CO}_2$ can fill the interior canopy area of the raft, potentially displacing breathable air ($\text{O}_2$) and creating an atmosphere hazardous to the occupants. High concentrations of $\text{CO}_2$ can cause dizziness, headaches, and eventual unconsciousness. Therefore, the immediate action required after the liferaft is fully inflated and before occupants board is to open the vents or entrance to clear the excess $\text{CO}_2$ and ensure a safe, breathable atmosphere. ### 2. Explanation for Other Options **B) freon gas:** Freon is a general term for certain chlorofluorocarbons (CFCs) or hydrochlorofluorocarbons (HCFCs) primarily used as refrigerants. It is not used as an inflation gas for maritime liferafts. **C) carbon monoxide gas:** Carbon monoxide ($\text{CO}$) is a highly toxic gas produced by incomplete combustion (e.g., engine exhaust or fire). While highly dangerous, it is not used as a component of the liferaft inflation system. If $\text{CO}$ were present, it would indicate a massive environmental hazard or contamination, not a routine issue related to the inflation process. **D) hydrocarbon gas:** Hydrocarbon gases (such as methane or propane) are highly flammable and are not used for the inflation of safety equipment like liferafts. Their presence would constitute a severe explosion risk, not the expected byproduct of the deployment procedure.