Four voltaic cells are set up. In each, one half-cell contains a standard hydrogen electrode (SHE). The second half-cell is one of the following. - V2+(aq,1.0M)V(s) - Fe2+(aq,1.0M)Fe(s) - Ba2+(q,1.0M)Ba(s) - Hg22+(aq,1.0M)Hg(l) (a) In which of the voltaic cells does the hydrogen electrode serve as the cathode? SHE&V2+(aq,1.0M)V(s)SHE&Fe2+(aq,1.0M)Fe(s)SHE&Ba2+(aq,1.0M)Ba(s)SHE&Hg22+(aq,1.0M)Hg(l) (b) Which voltaic cell produces the highest voltage? Which produces the lowest voltage? The highest voltage will be produced by combining the SHE and the half-cell. The lowest voltage will be produced by combining the SHE and the half-cell