JAMB Chemistry 2016 Paper

Concept:An ideal gas obeys $PV = nRT$ at all pressures, so its $PV$ value remains constant.Explanation:At constant temperature, $PV = nRT = \text{constant}$.Therefore, on a graph of $PV$ against pressure $P$, an ideal gas is represented by a straight horizontal line.Real gases deviate from this line because of intermolecular forces and molecular volume.From the diagram, the horizontal curve/line is the one labelled $M$.Answer:B. M