Kerosene and petrol mixture can be best separated by

Fractional distillation is the most suitable method for separating a mixture of kerosene and petrol because they are miscible liquids (liquids that dissolve in each other) with distinct boiling points. This technique is widely used in petroleum refineries to separate various components of crude oil.

• Principle: It works on the principle of difference in boiling points. Petrol has a lower boiling point (approx. 40°C to 120°C) compared to kerosene (approx. 150°C to 300°C). When heated, the more volatile component (petrol) vaporizes first, rises through the fractionating column, condenses, and is collected separately.
• Why other options are incorrect: A separating funnel is only used for immiscible liquids (like oil and water) that form distinct layers. Sublimation is used to separate a solid that directly turns into gas from a non-sublimable solid. Compressing and cooling is a method used to liquefy gases.