corrosion

What is corrosion?

• The release of oxygen

• Breakdown of a metal

Iron rust in the presence of:

• vacuum

• oxygen

• moisture

• moisture and oxygen

To protect iron against corrosion, the most durable metal plating on it, is:

• zinc plating

• nickel plating

Is this an example of corrosion?

• yes

• no

What is the chemical nature of rust?

• iron (II) oxide

• hydrated iron (II) oxide

• hydrated iron(III) oxide

Which diagram shows the most favourable conditions for rust to appear on the nail?

• A

• B

• C

• D

Which of the following metals is not attacked by the environment

• copper

• gold

Galvanizing is a process of:

• Applying a Zinc coating to bare steel

• Washing the body with the phosphate coating

• Chemically etching primer to steel

Chemical formula of RUST is

• FeCO₃

• Fe₂O₃. x H₂O

• CUSO₄.5H₂O

• CaCO₃.2H₂O

Rusting can be prevented by

• Alloying

• Galvanizing

• all of above