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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</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</p> Signup and view all the answers

Corrosion Quiz

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Questions and Answers

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

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

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

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

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

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