Answer :
Final answer:
The ignition temperature needed to burn petrol, kerosene, and similar fuels is within the range of 210-300°C (410-572°F).
Explanation:
The ignition temperature is the lowest temperature at which a fuel can vaporize to form a flammable mixture with the air and ignite without any external flame or spark. Petrol (gasoline) and kerosene are common fuels with specific ignition temperatures that ensure their safe use and storage. According to the given choices and the clues provided, we need to identify the ignition temperature for petrol, kerosene, and similar fuels. The flash points category guide indicates that a Category 3 fuel has a flash point below 100 °F but not exceeding 200 °F, while a Category 4 fuel is below 73 °F. However, the ignition temperature is typically higher than the flash point. Referring to the numerical clues provided and matching it with the choices in the question, a range from 210°C to 300°C (410-572°F) seems plausible for ignition temperatures of these fuels. The answer to the student's original question is: (C) 210-300°C (410-572°F) as the necessary ignition temperature needed to burn petrol, kerosene, etc.
