The equation below represents the incomplete combustion of ethane fuel in a limited supply of oxygen:
2C2H6(g)+5O2(g)→4CO(g)+6H2O(g) 2\text{C}_{2}\text{H}_{6}(\text{g}) + 5\text{O}_{2}(\text{g}) \rightarrow 4\text{CO}(\text{g}) + 6\text{H}_{2}\text{O}(\text{g}) 2C2H6(g)+5O2(g)→4CO(g)+6H2O(g)Which statement correctly describes the change in the oxidation state of carbon and the chemical process it undergoes?
The average oxidation state of carbon increases from −3-3−3 to +2+2+2, showing that carbon is oxidised.
The average oxidation state of carbon decreases from +3+3+3 to −2-2−2, showing that carbon is reduced.
The average oxidation state of carbon increases from −6-6−6 to +2+2+2, showing that carbon is oxidised.
The average oxidation state of carbon increases from −3-3−3 to +2+2+2, showing that carbon is reduced.
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.