WorksheetsModule 2 : CORROSION
Total questions: 15
Worksheet time: 30mins
Rusting is a _____________ process.
Mechanical
Chemical
Physical
Thermal
Rusting of iron is an example of
Dry corrosion
Chemical corrosion
Electrochemical corrosion
Galvanic corrosion
Iron rust in the presence of:
Vacuum
Moisture
Oxygen
Moisture and Oxygen
Chemical formula of RUST is
FeCO3
CUSO4.5H2O
Fe2O3. x H2O
CaCO3.2H2O
What is the chemical nature of rust?
iron (II) oxide
Iron (III) chloride
iron (III) oxide
hydrated iron(III) oxide
Rusting can be prevented by
Alloying
Tinning
Galvanizing
All of above
During rusting of iron, reaction occuring at cathode is
2 Fe (s)→2 Fe2+ + 4 e
O2(g) + 4 H+(aq) + 4 e ⎯→ 2 H2O (l )
2 Zn (s)→2 Zn2+ + 4 e
2 Cu (s)→2 Cu2+ + 4 e
Corrosion can be prevented by
Alloying with other elements
Dehumidification of environment
Cathodic protection
All of the above
Which of the following metal would protect iron by cathodic protection
Silver
Gold
Copper
Magnesium
Which of the following is / are examples of sacrificial protection against rusting?
(1) Iron object coated with tin
(2) Underground iron pipes connected to magnesium bars
(3) Iron railings coated with paint
(1) only
(2) only
(1) and (3) only
(2) and (3) only
Galvanizing is a process of:
Applying a Zinc coating to bare steel
Washing the body with the phosphate coating
dipping a body in E-COAT
Chemically etching primer to steel
Underground pipes are protected by
Using antirust solutions
Cathodic protection
Using paints
Alloying with other elemts
Choose the WRONG statement
Dry corrosion occurs in the absence of moisture
Wet corrosion involves the formation of electrochemical cell
Wet corrossion is a slow process
The process of dry corrosion is uniform
An example for sacrificial protection is
Coating with tin (Sn) metal
Coating with paint
Coating iron with a thin layer of zinc or magnesium
Alloying with other elements
An example for antirust solution is
alkaline potassium sulphate
sodium chloride
Alkaline potassium phosphate
sodium carbonate
