When hydrogen peroxide decomposes in the presence of $\text{MnO}_2$, water and oxygen gas are produced. $2\text{H}_2\text{O}_2(aq) \rightarrow 2\text{H}_2\text{O}(l) + \text{O}_2(g)$ The volume of gas collected after $0.2\text{ g}$ of $\text{MnO}_2$ is added to two different hydrogen peroxide solutions at $20\,^\circ\text{C}$ is displayed on the graph as curves X and Y. Which row identifies the conditions that will give curves X and Y?
Chemistry 9701 · AS & A Level · Reaction kinetics