Prevention of Corrosion
Chemistry ⇒ Metals and Non-metals
Prevention of Corrosion starts at 8 and continues till grade 12.
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See sample questions for grade 8
A ship's hull is often fitted with blocks of zinc. Explain why.
Describe how electroplating helps in preventing corrosion.
Describe sacrificial protection with an example.
Describe the process of galvanization.
Explain how applying oil or grease prevents corrosion of iron.
A ship's hull is often fitted with blocks of zinc. Explain why.
Explain why iron nails rust faster in saline water than in pure water.
Explain why iron objects kept in coastal areas rust faster than those kept inland.
Which method is NOT used to prevent corrosion? (1) Oiling (2) Painting (3) Exposing to moisture (4) Galvanizing
Which of the following is a disadvantage of corrosion? (1) Increases strength (2) Causes damage to structures (3) Makes metals shiny (4) Reduces cost
Which of the following is a method of protecting iron from rusting by using a more reactive metal? (1) Painting (2) Alloying (3) Sacrificial protection (4) Anodizing
Which of the following is a method to prevent corrosion in iron pipes carrying water? (1) Painting (2) Galvanizing (3) Both (1) and (2) (4) None of these
Filling the blank: The brown flaky substance formed on iron due to corrosion is called __________.
Filling the blank: The chemical formula for rust is __________.
Filling the blank: The process of applying a protective layer of paint to a metal surface is called __________.
Filling the blank: The process of applying a thin layer of oil or grease to a metal surface is called __________.
True or False: All metals corrode at the same rate.
True or False: Alloying iron with chromium and nickel produces stainless steel, which is resistant to corrosion.
True or False: Corrosion can be completely stopped by painting a metal object once.
True or False: Corrosion can only occur in the presence of water.
