Test Yourself : Ch13 Corrosion of metals and their protection

Which of the following is NOT a factor that speeds up rusting?

• A. High temperature
• B. Presence of soluble ionic compounds
• C. Sharp area of an iron object
• D. Attachment of a more reactive metal to iron

Which of the following statements concerning rusting are correct?

(1) Rusting refers to the corrosion of all metals.

(2) Water and air are necessary for rusting to occur.

(3) Rusting can be observed using a rust indicator.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Which of the following ions will form during rusting?

(1) Fe²⁺

(2) Fe(CN)₆³⁻

(3) OH⁻

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Food cans can be made of tin-plated iron because

(1) tin is more reactive than iron and it loses electrons more readily than iron.

(2) tin protects iron from rusting by preventing it from contacting air and water.

(3) tin and tin ions are not poisonous.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Which of the following does NOT involve sacrificial protection?

• A. Connecting magnesium blocks to underground pipelines
• B. Coating iron-made objects with a layer of tin
• C. Galvanized iron
• D. Attaching zinc blocks to ship hulls

Which of the following metals, when connected to iron, can protect iron from rusting?

• A. Aluminium
• B. Lead
• C. Copper
• D. Silver

Which of the following statements concerning stainless steel are correct?

(1) It is an alloy of iron and other metals such as nickel.

(2) It is corrosion resistant.

(3) It is commonly used to make cookware.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Which of the following statements concerning anodization are correct?

(1) Anodization increases the thickness of the oxide layer on the aluminium surface.

(2) Anodized aluminium becomes more corrosion resistant.

(3) Anodized aluminium can be dyed to give attractive colours.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)