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Crude Oil, Hydrocarbons And Alkanes (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Crude Oil, Hydrocarbons And Alkanes' from the broader topic Organic Chemistry. The test is geared towards the AQA exam board style syllabus.
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Which environmental issue is directly linked to burning fossil fuels such as crude oil fractions?
Which fraction would you expect to have the highest boiling point?
What is the complete combustion product of hexane (C6H14) in excess oxygen?
Which fraction of crude oil would most likely be used to make petrol (gasoline) for cars?
Which statement best describes alkanes?
Which of the following correctly gives the general formula for an alkane?
Which of the following is a pollutant commonly produced by incomplete combustion of hydrocarbons?
Why is catalytic cracking used in oil refineries?
Why are small alkanes (e.g., methane, propane) gases at room temperature while larger alkanes are liquids or solids?
Which property explains why alkanes are insoluble in water?
Which fraction from crude oil is most commonly used as aviation fuel (jet fuel/kerosene)?