What is petroleum and how is it refined? [2 MARKS]
Petroleum : 1 Mark
Refining : 1 Mark
Petroleum is a dark oily liquid. It has an unpleasant odour. It is a mixture of various constituents such as petroleum gas, petrol, diesel, lubricating oil, paraffin wax, etc.
Fractional distillation is the process used for separating the various constituents of petroleum.