|
|
|
|
Multiple Choice Questions on Understanding Corrosion |
|
| Questions 1 - 5 |
Page 1 of 4 |
|
|
|
|
1. |
The electrode potential of a metal is: |
|
|
[ ] |
The potential which exists at the interface between the metal and the electrode |
|
|
[ ] |
The potential between the anodic and cathodic areas of the metal |
|
|
[ ] |
The potential between two metals immersed completely in the same electrolyte |
|
|
[ ] |
The potential of a metal with respect to another metal, which is at a higher concentration |
|
|
2. |
The double layer is formed as a result of |
|
|
[ ] |
attractive forces of negative and positive ions only |
|
|
[ ] |
repulsive forces between like positive ions only |
|
|
[ ] |
both attractive and repulsive forces between ions |
|
|
[ ] |
None of the above |
|
|
3. |
Standard electrode potential is: |
|
|
[ ] |
the potential which is developed when a metal is immersed in a solution of its ions, such as Zn in a solution of ZnSO4 |
|
|
[ ] |
the absolute electrode potential of metals |
|
|
[ ] |
the potential which is developed when a metal is immersed in a solution of its ions at unity activity measured with respect to a hydrogen electrode in which [H+] = 1 M, pH2 = 1 atm, T = 298 K |
|
|
[ ] |
None of the above |
|
|
4. |
The most acceptable method of obtaining standard electrode potential is by: |
|
|
[ ] |
comparing the electrode potentials of a metal half cell with a hydrogen half cell |
|
|
[ ] |
comparing the electrode potential of a metal immersed in a solution of its ions at any concentration, with the hydrogen half cell |
|
|
[ ] |
comparing the electrode potential of a metal with any standard electrode, such as Ag-AgCl or Calomel electrode |
|
|
[ ] |
None of the above |
|
|
5. |
According to the IUPAC system, Ecell is equal to: |
|
|
[ ] |
Eleft - Eright |
|
|
[ ] |
Eright - Eleft |
|
|
[ ] |
Eanode - Ecathode |
|
|
[ ] |
Eright + Eleft |
|
|
|