JAMB Chemistry 2015 Paper

Concept:Steam reacts with red-hot carbon to form a gaseous mixture known as water gas.Explanation:When steam ($\mathrm{H_2O}$) is passed over red-hot carbon ($\mathrm{C}$), a redox reaction takes place.Carbon is oxidised, and steam is reduced.The reaction is: $$\mathrm{C(s) + H_2O(g) \xrightarrow{\text{red heat}} CO(g) + H_2(g)}$$The products are carbon(II) oxide, $\mathrm{CO}$, commonly called carbon monoxide, and hydrogen gas, $\mathrm{H_2}$.This mixture is known as water gas.Oxygen gas is not produced, and no acid such as trioxocarbonate(IV) acid is formed.Answer:C. hydrogen and carbon (II) oxide