What is the half-reaction that occurs at the cathode during the electrolysis of molten sodium bromide?

Question

1. Br2 + 2e- ---> 2Br-

2. Na ---> Na+ + 1e-

3. Na+ + 1e- ---> Na

4. 2Br- ---> Br2 + 2e-

5. 2H2O + 2e- ---> 2OH- + H2

Answer 1

#3 Just remember CATions are attracted to the CAThode

Answer 2

3.