The rate of reaction for magnesium ribbon reacting with $2\,\text{mol dm}^{-3}$ hydrochloric acid at $25^\circ\text{C}$ to form hydrogen gas is measured. In a second experiment, either the concentration of the hydrochloric acid or the temperature is changed. All other conditions stay the same. Which conditions increase the rate of reaction?
- A$1\,\text{mol dm}^{-3}$ hydrochloric acid at $25^\circ\text{C}$
- B$2\,\text{mol dm}^{-3}$ hydrochloric acid at $10^\circ\text{C}$
- C$2\,\text{mol dm}^{-3}$ hydrochloric acid at $20^\circ\text{C}$
- D$3\,\text{mol dm}^{-3}$ hydrochloric acid at $25^\circ\text{C}$