Corrosion and Its Prevention
Trending Questions
Q. Which of the following metals do not undergo corrosion?
- Iron
- Gold
- Copper
- Silver
Q. How is an iron gate prevented from rusting? (2 marks)
[APSCERT Textbook]
[APSCERT Textbook]
Q. During corrosion, iron reacts with which of the following substances that are present in the atmosphere?
- Oxygen
- Moisture
- Nitrogen
- Carbon dioxide
Q. Which of the following are true in the case of corrosion?
- Causes metals to shrink
- Damages things made up of metals
- Increases strength of metals
- Metal strength remains unaffected
Q. Iron articles are shiny when new, but get coated with a reddish brown layer when left in open for a long time.
- True
- False
Q. Which of the following metal is used to coat iron articles during galvanisation?
- Lead
- Mercury
- Zinc
- Copper
Q. A shiny brown metal X when exposed to the atmosphere undergoes corrosion and develops a greenish layer Y on its surface. Identify X and Y.
- X: Copper
Y: Copper sulphate - X: Copper
Y: Copper carbonate - X: Iron
Y: Iron oxide - X: Iron
Y: Iron hydroxide
Q. Statement I: Corrosion occurs when metals are exposed to atmospheric oxygen and water.
Statement II: Galvanisation is the process of applying thin zinc coating over iron articles.
Statement II: Galvanisation is the process of applying thin zinc coating over iron articles.
- Only statement I is correct
- Only statement II is correct
- Both statements are incorrect
- Both statements are correct
Q. Iron when reacts with moist air forms a reddish brown layer of iron oxide which is known as rust.
- True
- False
Q. Statement I: If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Statement II: Rusting of iron is a chemical change.
Statement II: Rusting of iron is a chemical change.
- Both the statements are correct.
- Both the statement are incorrect.
- Only statement I is correct.
- Only statement II is correct.