Neco Model Questions Vol1 2025 Chemistry Question 2

Three metal strips – magnesium (Mg), zinc (Zn) and copper (Cu) – were each placed in separate 250 mL conical flasks containing 100 mL of 0.500 M dilute hydrochloric acid (HCl) at 25 °C. The flasks were fitted with inverted measuring cylinders to collect the hydrogen gas evolved at normal temperature and pressure (NTP). Each reaction was allowed to proceed for exactly 2.00 min, after which the volume of gas collected was recorded. Experimental data obtained: | Metal | Mass of metal (g) | Volume of H₂ collected (mL) | |-------|-------------------|-----------------------------| | Mg | 0.250 | 48.0 | | Zn | 0.300 | 30.0 | | Cu | 0.250 | 0.0 | Using the information above, answer the following questions.