JAMB Chemistry 2012 Paper

Concept:At constant temperature, gas pressure and volume are inversely related (Boyle’s law).Explanation:For a fixed amount of gas at constant temperature, $P_1V_1 = P_2V_2$.If pressure increases, volume must decrease to keep the product constant.This means gas molecules become more closely packed, so the average intermolecular distance decreases.Answer:B. a decrease in volume