Redox and Electrochemistry

1.) Give the oxidation number of each element in the following:
      KIF4

2.) Is the following reaction a redox reaction? If yes, then what is the oxidizing agent and what is the reducing agent.
     3NO3(g)+H20(l)-----2HNO3(aq)+NO(g)

3.)  Write the balanced net ionic equation for the following reaction. Tell what substance is oxidized and which is reduced.
      A solution of nickel (II) sulfate is electrolyzed

4.) Write the balanced net ionic equation for the following reaction. Tell what substance is oxidized and which is reduced.
      Solid zinc sulfide is burned in excess oxygen