WAEC Chemistry 2014 Paper

Concept:Boyle's law describes how the pressure of a gas changes when its volume changes, while temperature remains constant.Explanation:For a fixed amount of gas kept at a constant temperature, pressure and volume are inversely proportional to each other.This inverse relationship is expressed as:$$P \propto \frac{1}{V}$$So, when the volume of the gas increases, the pressure decreases by the same factor.Similarly, when the volume decreases, the pressure increases.Therefore, the correct relation is that pressure varies inversely with volume at constant temperature.Answer:C. $P \propto \frac{1}{V}$ at constant $T$