Corrosion MCQ Questions and Answers for Practice

1. Chemical formula of Rust is

1. Fe₂O₃
2. FeO
3. Fe₃O₄
4. Fe₂O₃.XH₂O

2. Electrochemical corrosion takes place on

1. Anodic area
2. Cathodic area
3. Near cathode
4. Near anode

3. Lower is P^H, corrosion is

1. Greater
2. Lower
3. Constant
4. None of above

4. Process of corrosion enhanced by

1. AIR & Moisture
2. Electrolytes in water
3. Metallic impurities
4. All of above

5. Smaller the grain size, corrosion is

1. Greater
2. Lower
3. Constant
4. Doesnt affected

6. Standard electrode potential of Al / Al³⁺ is

1. + 0.66V
2. - 0.66 V
3. - 1.66 V
4. + 1.66 V

7. Standard electrode potential of Fe²⁺/Fe is

1. + 0.44 V
2. - 0.44 V
3. + 1.44 V
4. - 1.44 V

8. Standard electrode potential of hydrogen is

1. 1.00 V
2. 0.00 V
3. 0.01 V
4. 0.001 V

9. Standard electrode potential of Zn²⁺/ Zn is

1. - 0.76 V
2. + 0.76 V
3. - 2.76 V
4. + 2.76 V

10. Volatile oxidation corrosion product of a metal is

1. Fe₂O₃
2. MoO₃
3. Fe₃O₄
4. FeO

11. Which of following metals could provide cathodic protection to Fe?

1. Al & Cu
2. Al & Zn
3. Zn & Cu
4. Al & Ni

12. Which of the following gases accelerates rusting of iron?

1. CO₂
2. SO₂
3. NO₂
4. All of above

13. Which of the following metal does not resists the corrosion process?

1. Ni
2. Cu
3. Pb
4. Fe