Consider an electrochemical cell constructed from the following half cells, linked by a KCl salt bridge.
- a Fe electrode in 1.0 M FeCl₂ solution
- a Ni electrode in 1.0 M Ni(NO₃) ₂ solution
When the cell is running spontaneously, which choice includes only true statements and no false ones

Question

Quizplus · Accepted Answer

In the electrochemical cell, Fe is in the anode and Ni is in the cathode. The anode is where oxidation occurs and the cathode is where reduction occurs. In this case, Fe is oxidized to Fe2+ and Ni2+ is reduced to Ni. The salt bridge allows ions to flow and balance the charges in both half-cells. 
Since Fe is the anode, it loses mass during the reaction, and Ni is the cathode, where it gains mass due to the reduction of Ni2+. Therefore, option A and D are false. Option C is false since, as we just explained, Fe is the anode and it loses mass, not gains it. Option B is the only true statement: the nickel electrode gains mass, and the nickel electrode is the cathode.

Consider an Electrochemical Cell Constructed from the Following Half Cells