Correct Option
The correct option isRefining
Explanation
Petroleum (crude oil) is a complex mixture of various hydrocarbons, including petroleum gas, petrol, diesel, lubricating oil, and paraffin wax. These constituents have different boiling points and physical properties. To make crude oil useful, these components must be separated.
Analysis of Options
- Carbonisation: Incorrect. Carbonisation is the slow chemical process of converting dead vegetation (organic matter) into coal under high pressure and temperature in the absence of air. It is unrelated to petroleum processing.
- Refining: Correct. The specific industrial process of separating the various constituents or fractions of petroleum is technically termed refining. This process is carried out in a petroleum refinery using fractional distillation columns.
- Distillation: Incorrect. While fractional distillation is the physical technique or method used within the refining process to separate components based on boiling points, the overall industrial operation is defined as refining. In the context of the specific terminology for processing petroleum, "refining" is the precise answer.
- Extraction: Incorrect. Extraction generally refers to separating a substance from a matrix (often using a solvent). It is not the standard term for the separation of crude oil fractions.
Key Takeaway
Refining is the industrial process used to separate crude petroleum into useful fractions like petrol, diesel, and kerosene, primarily through fractional distillation.