10-minute Quiz : Ch13 Corrosion of metals and their protection

Which of the following statements concerning rusting of iron is/are correct?

(1) The surface of rusted objects is rough and flaky.

(2) Iron(III) oxide forms on the iron surface after rusting.

(3) Iron is reduced when it forms rust.

• A. (1) only

• B. (2) only

• C. (1) and (3) only

• D. (2) and (3) only

Refer to the diagram showing an experiment. Which of the following statements correctly describe the expected results of this experiment?

(1) Only the iron nail in Tube 2 shows no rusting.

(2) The iron nail in Tube 1 rusts more quickly than the iron nail in Tube 3.

(3) The iron nail in Tube 1 rusts more slowly than the iron nail in Tube 4.

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Which of the following methods CANNOT be used to prevent iron from rusting?

• A. Coating iron surface with silver
• B. Plating iron surface with zinc
• C. Attaching iron with a piece of tin
• D. Connecting iron to a piece of magnesium

Refer to the set-up shown in the diagram. Which of the following metals may X be that can prevent the iron nail from rusting?

(1) Copper wire

(2) Aluminium wire

(3) Chromium wire

• A. (1) only

• B. (2) only

• C. (1) and (3) only

• D. (2) and (3) only

Which of the following methods is best used to prevent coat hangers from rusting?

• A. Painting
• B. Coating with plastic
• C. Tin-plating
• D. Alloying

Which of the following methods is best used to prevent sewing needles from rusting?

• A. Painting
• B. Coating with grease
• C. Electroplating
• D. Alloying

Which of the following methods is best used to prevent iron screws from rusting?

• A. Painting
• B. Coating with grease
• C. Galvanizing
• D. Alloying

Which of the following methods are suitable for preventing steel legs of oil rigs from corrosion?

(1) Painting

(2) Sacrificial protection

(3) Cathodic protection

• A. (1) and (2) only

• B. (1) and (3) only

• C. (2) and (3) only

• D. (1), (2) and (3)

Consider the following statements and choose the best answer:

1st statement:

Iron objects get rusted faster in deserts.

2nd statement:

Rusting happens faster at high temperatures.

• A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

• B. Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

• C. The 1st statement is false but the 2nd statement is true.

• D. Both statements are false.

Consider the following statements and choose the best answer:

1st statement:

A shipwreck in deep water corrodes less quickly than a shipwreck in shallow water.

2nd statement:

Deep water has less dissolved air than shallow water.

• A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

• B. Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

• C. The 1st statement is false but the 2nd statement is true.

• D. Both statements are false.