Which of the following is true?

• Oxidation occurs at the cathode and oxidation occurs at the anode.
• Reduction occurs at the cathode and oxidation occurs at the anode.
• Oxidation occurs at the cathode and reduction occurs at the anode.
• Reduction occurs at the cathode and oxidation occurs at the cathode.

A metal anode has a standard reduction potential of minus 1.56 V and the cathode has a reduction potential of minus 1.16 V. What is the E⁰ _cell?

• -0.40 V
• +2.72 V
• +0.40 V
• -2.72 V

What solution is used as the salt bridge in all of these experiments?

• C u(NO₃)₂
• Zn(NO₃)₂
• A l(NO₃)₃
• Pb(NO₃)₂
• KNO₃