Table 1 shows the percentage composition of various fractional distillates obtained from crude oil samples extracted from three different oil reserves.
| Fraction | Boiling point range (°C) | Percentage in Reserve X (%) | Percentage in Reserve Y (%) | Percentage in Reserve Z (%) |
|---|---|---|---|---|
| Liquified petroleum gases | < 25 | 2 | 8 | 15 |
| Gasoline | 25–150 | 8 | 18 | 32 |
| Kerosene | 150–230 | 12 | 22 | 18 |
| Diesel | 230–320 | 25 | 20 | 15 |
| Fuel oil | 320–400 | 33 | 17 | 12 |
| Residue | > 400 | 20 | 15 | 8 |
State which oil reserve yields crude oil with the highest total percentage of low boiling point fractions (liquified petroleum gases and gasoline).
130 exam-style questions on Edexcel GCSE Chemistry 9.1 Fuels, covering 9.1.1 Hydrocarbons and crude oil, 9.1.2 Fractional distillation of crude oil and its fractions, 9.1.3 The alkanes as a homologous series, 9.1.4 Complete and incomplete combustion, 9.1.5 Pollutants from burning fuels, 9.1.6 Hydrogen as a fuel and non-renewable fossil fuels, and 9.1.7 Cracking of larger alkanes. Each one has a worked solution and a mark scheme showing where the marks go.