Nernst Equation

The equilibrium constant for the reaction Zn(s) + Cu²⁺ (aq.) → Cu(s) + Zn²⁺ (aq.), E° = 1.10 V at 298 K is

Maximum emf among the following is of

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 4 and passing hydrogen gas around the platinum wire at one atm pressure and at 298 K. The reduction potential of the hydrogen electrode would be