Corrosion Quiz

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Questions and Answers

What causes silver articles to become black after some time when exposed to air?

  • Direct contact with carbon dioxide in the air
  • Reaction with nitrogen in the air to form a coating of silver nitride
  • Exposure to water vapor in the air
  • Reaction with sulphur in the air to form a coating of silver sulphide (correct)

What is the green substance that forms on copper when it reacts with moist carbon dioxide in the air?

  • Copper hydroxide
  • Copper sulfate
  • Basic copper carbonate (correct)
  • Copper oxide

What substance forms a coating on iron when it is exposed to moist air for a long time?

  • Iron oxide
  • Rust (correct)
  • Iron sulfide
  • Iron hydroxide

In which test tube do iron nails rust according to the experiment described?

<p>Test tube A, where the nails are exposed to both air and water (D)</p> Signup and view all the answers

What can be inferred about the conditions under which iron articles rust based on the experiment with the test tubes?

<p>Both air and water are necessary for iron articles to rust (B)</p> Signup and view all the answers

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