JAMB Chemistry 2020 Paper

Concept:The graph shows the relationship between volume and absolute temperature for a fixed mass of gas at constant pressure.Explanation:A straight-line graph that passes through the origin indicates direct proportionality.Here, volume $V$ is directly proportional to absolute temperature $T$.This gives the relation $\frac{V}{T} = \text{constant}$.That relation is Charles's Law, which states that at constant pressure, the volume of a given mass of gas is directly proportional to its absolute temperature.Thus, the graph illustrates Charles's Law.Answer:B. Charles