34. Solving a chemistry problem

Option 4. (Pt in KOH H2)
1. What type of electrode is the schematic representation of which is shown below?
2. Write down the electrode reaction taking place on this electrode, if it is located in any galvanic cell on the left.
3. Write down a schematic diagram of a galvanic cell, the electromotive force of which is equal to the electrode potential of this electrode.
4. Write down the Nernst equation to calculate the electrode potential of this electrode.