On the basis of the reactions observed in the six test tubes, explain why the position of hydrogen cannot be fixed exactly with respect to all of the other elements listed in the activity series in Questions 5? What additional test(s) would be needed to establish the exact position of hydrogen in the activity series of the elements listed in Question 5? On the basis of the evidence developed in this experiment: a) Would silver react with dilute sulfuric acid? Why or why not? b) Would magnesium react with dilute sulfuric acid? Why or why not?