### Correct Option: B. CO, HCl, and SO2 #### Explanation of the Correct Answer When petrol (gasoline) is spilled and ignited, it undergoes combustion. Petrol is primarily composed of hydrocarbons, which are organic compounds made up of hydrogen and carbon. The combustion of hydrocarbons typically produces carbon dioxide (CO2) and carbon monoxide (CO) as the primary products, depending on the availability of oxygen. However, when petrol is spilled on plastic materials and ignited, several additional factors come into play. 1. **Combustion of Hydrocarbons**: - In a complete combustion scenario, hydrocarbons react with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The general reaction can be represented as: \[ \text{Hydrocarbon} + O_2 \rightarrow CO_2 + H_2O \] - Incomplete combustion, which is more likely in a spill scenario due to limited oxygen, produces carbon monoxide (CO) instead of CO2: \[ \text{Hydrocarbon} + O_2 \rightarrow CO + H_2O \] 2. **Combustion of Plastics**: - Plastics are typically made from polymers, which can also contain chlorine (Cl) in their structure (e.g., polyvinyl chloride, PVC). When these plastics are burned, they can release hydrochloric acid (HCl) gas as a byproduct: \[ \text{Chlorinated polymer} + O_2 \rightarrow CO_2 + HCl + H_2O \] - This reaction occurs because the chlorine atoms in the plastic can combine with hydrogen during combustion to form HCl. 3. **Sulfur Dioxide (SO2)**: - While petrol itself does not contain sulfur, if the plastic materials contain any sulfur compounds or if there are impurities in the fuel, burning these materials can produce sulfur dioxide (SO2). This is less common but can occur in certain conditions. Given these reactions, the most likely pollutants produced when petrol is spilled on plastic and ignited are carbon monoxide (CO), hydrochloric acid (HCl), and potentially sulfur dioxide (SO2) if sulfur is present in the materials being burned. #### Why Other Options Are Incorrect - **Option A: CO, CO2, and SO2** - This option includes CO2, which is a product of complete combustion. However, in the scenario of a petrol spill on plastic, incomplete combustion is more likely, leading to the production of CO instead of CO2. Therefore, this option is less accurate. - **Option C: CO, CO2, and HCl** - Similar to Option A, this option includes CO2. While it correctly identifies CO and HCl, the presence of CO2 makes it less likely to be the correct answer due to the incomplete combustion scenario. - **Option D: SO2, CO2, and HCl** - This option includes CO2 and SO2. While it correctly identifies HCl, the presence of CO2 again suggests complete combustion, which is not the case in a petrol spill scenario. Therefore, this option is also incorrect. ### Summary of Key Points - **Incomplete Combustion**: Petrol spills lead to incomplete combustion, producing CO instead of CO2. - **Plastic Combustion**: Burning plastics can release HCl due to chlorine content. - **Potential SO2 Production**: SO2 may be produced if sulfur compounds are present in the materials. - **Correct Pollutants**: The most likely pollutants from this scenario are CO, HCl, and potentially SO2. This thorough understanding of combustion processes and the nature of the materials involved is crucial for identifying the correct pollutants produced in such scenarios.