JAMB Chemistry 2024 Paper

Concept:For equilibria involving gases, a change in pressure affects the side with fewer total moles of gas.Explanation:Consider only gaseous species: $\mathrm{H}_2(g)$ on the left and $\mathrm{H}_2\mathrm{O}(g)$ on the right.Solids like $\mathrm{CuO}(s)$ and $\mathrm{Cu}(s)$ do not affect pressure equilibrium.Left side has $1$ mole of gas: $\mathrm{H}_2(g)$.Right side also has $1$ mole of gas: $\mathrm{H}_2\mathrm{O}(g)$.Since both sides have equal numbers of gas moles, an increase in pressure does not favour either side.Therefore, the equilibrium position remains unchanged.Answer:C. there is no effect