WAEC Chemistry 2015 Paper

Concept:The general gas equation is formed by combining the basic gas laws into a single relationship.Explanation:Boyle's law states that pressure is inversely proportional to volume at constant temperature: $P \propto \frac{1}{V}$.Charles' law states that volume is directly proportional to absolute temperature at constant pressure: $V \propto T$.Combining these two laws gives the relation $\frac{PV}{T} = \text{constant}$.This relation can be written as $\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}$.When the amount of gas is also included, the general gas equation becomes $PV = nRT$.Therefore, the general gas equation is mainly derived from Boyle's law and Charles' law.Answer:C. Boyle's and Charles' laws