Corrosion of Metals
Chemistry ⇒ Metals and Non-metals
Corrosion of Metals starts at 8 and continues till grade 12.
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See sample questions for grade 10
A ship made of iron is used in seawater. Explain why it corrodes faster than in freshwater.
A steel bridge is exposed to rain and air. Suggest two ways to protect it from corrosion and explain how they work.
Describe the difference between corrosion and rusting.
Describe the role of moisture in the corrosion of iron.
Describe two ways to prevent the corrosion of iron.
A ship made of iron is used in seawater. Explain why it corrodes faster than in freshwater.
A steel bridge is exposed to rain and air. Suggest two ways to protect it from corrosion and explain how they work.
Explain why iron nails rust faster in saline water than in distilled water.
Which environmental factor does NOT accelerate corrosion?
(1) High humidity
(2) Presence of salts
(3) Dry air
(4) Acidic atmosphere
Which of the following is a chemical reaction involved in the rusting of iron?
(1) 4Fe + 3O₂ + xH₂O → 2Fe₂O₃·xH₂O
(2) 2Fe + O₂ → 2FeO
(3) Fe + H₂O → Fe(OH)₂
(4) Fe + CO₂ → FeCO₃
Which of the following is a disadvantage of corrosion?
(1) Increases strength of metal
(2) Causes economic loss
(3) Improves appearance
(4) Makes metal more durable
Which of the following is NOT a factor affecting the rate of corrosion?
(1) Temperature
(2) Presence of impurities
(3) Shape of the metal
(4) Humidity
Fill in the blank: The green coating that forms on copper due to corrosion is called ________.
Fill in the blank: The process of applying a protective layer of paint on metal surfaces to prevent corrosion is called ________.
Fill in the blank: The process of depositing a thin layer of zinc on iron objects to prevent rusting is called ________.
Fill in the blank: The process of protecting iron by connecting it to a more reactive metal is called ________ protection.
True or False: All metals corrode at the same rate.
True or False: Corrosion can weaken the structure of bridges and buildings.
True or False: Corrosion is always a slow process.
True or False: Rusting is a type of corrosion that specifically affects iron.
