Engineering Chemistry MCQs 1 (CORROSION AND LUBRICANTS)

These are Engineering Chemistry MCQs 1. In the field of engineering, a chemical engineer is a professional, who is equipped with the knowledge of chemical engineering, works principally in the chemical industry to convert basic raw materials into a variety of products, and deals with the design and operation of plants and equipment.

Topic =>CORROSION AND LUBRICANTS

1. Volatile oxidation corrosion product of a metal is,

• Fe₂O₃
• MoO₃
• Fe₃O₄
• FeO

2. Lower is pH, corrosion is,

• Greater
• Lower
• Constant
• None of above

3. Electrochemical corrosion takes place on,

• Anodic area
• Cathodic area
• Near cathode
• Near anode

4. Chemical formula of Rust is,

• Fe₂O₃
• FeO
• Fe₃O₄
• Fe₂O₃.XH₂O

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

• Al & Cu
• Al & Zn
• Zn & Cu
• Al & Ni

6. Smaller the grain size, corrosion is,

• Greater
• Lower
• Constant
• Doesn’t affected

7. Process of corrosion enhanced by,

• AIR & Moisture
• Electrolytes in water
• Metallic impurities
• Gases like CO2 & SO2
• All of above.

8. Standard electrode potential of hydrogen is,

• 1.00 V
• 0.00 V
• 0.01 V
• 0.001 V

9. Standard electrode potential of Al / Al3+ is,

• + 0.66V
• - 0.66 V
• - 1.66 V
• + 1.66 V

10. Standard electrode potential of Zn²⁺/ Zn is,

• - 0.76 V
• + 0.76 V
• - 2.76 V
• + 2.76 V