A fractionating column has collecting trays at these temperatures, from the bottom of the column to the top:
350 ∘C350\,^\circ\mathrm{C}350∘C, 250 ∘C250\,^\circ\mathrm{C}250∘C, 200 ∘C200\,^\circ\mathrm{C}200∘C, 150 ∘C150\,^\circ\mathrm{C}150∘C, 100 ∘C100\,^\circ\mathrm{C}100∘C, 40 ∘C40\,^\circ\mathrm{C}40∘C
Decane, C10H22\mathrm{C_{10}H_{22}}C10H22, boils at 174 ∘C174\,^\circ\mathrm{C}174∘C.
At which tray will most of the decane condense and be collected?
the tray at 100 ∘C100\,^\circ\mathrm{C}100∘C
the tray at 150 ∘C150\,^\circ\mathrm{C}150∘C
the tray at 200 ∘C200\,^\circ\mathrm{C}200∘C
the tray at 250 ∘C250\,^\circ\mathrm{C}250∘C
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.