What will be the product or products if zinc (Zn) reacts with hydrochloric acid (HCl) ? A reaction chart for some elements. At the top of the chart is the label Most active. At the bottom of the chart is the label Least active. The following elements are listed, from top to bottom-Li, K, Ba, Sr, Ca, Na, Mg, Al, Mn, Zn, Fe, Cd, Co, Ni, Sn, Pb, H, Cu, Ag, Hg, Au. Zn 2HCl ZnCl2 H2 Zn ZnH2 Cl2 A reaction chart for some elements. At the top of the chart is the label Most active. At the bottom of the chart is the label Least active. The following elements are listed, from top to bottom-Li, K, Ba, Sr, Ca, Na, Mg, Al, Mn, Zn, Fe, Cd, Co, Ni, Sn, Pb, H, Cu, Ag, Hg, Au. Assessment navigation.