an experiment was set up with three metal rods D, E and F placed in a beaker of water. After some time, bubbles were seen forming around metal E only. Another set of the same metals was placed in a beaker containing hydrochloric acid. Bubbles formed around metals E and F only a) Arrange the three metals in order of their reactivity, starting with the most reactive b)Which gas is produced in this experiment c)State how the identity of the gas mentioned can be confirmed