Which of the following reactions represents the laboratory preparation of hydrogen?
Answer Details
The reaction that represents the laboratory preparation of hydrogen is Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g). In this reaction, zinc metal reacts with hydrochloric acid to produce hydrogen gas and zinc chloride. The other reactions do not produce hydrogen gas as one of their products or involve hydrogen gas as a reactant.