WAEC Chemistry 2017 Paper

Concept:Car exhaust pollutants are harmful gases that come from incomplete combustion of fuel or from impurities present in the fuel.Explanation:Carbon(II) oxide ($\mathrm{CO}$) is formed when fuel burns incompletely in a car engine.Sulphur(IV) oxide ($\mathrm{SO}_2$) is produced when sulphur impurities in the fuel burn.Both $\mathrm{CO}$ and $\mathrm{SO}_2$ are harmful gases released in car exhaust.Carbon(IV) oxide ($\mathrm{CO}_2$), nitrogen ($\mathrm{N}_2$), and oxygen ($\mathrm{O}_2$) are not considered harmful car-exhaust pollutants in this context.Answer:C. Carbon(II) oxide and Sulphur(IV) oxide