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Questions and Answers
What causes silver articles to become black after some time when exposed to air?
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?
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?
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?
In which test tube do iron nails rust according to the experiment described?
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What can be inferred about the conditions under which iron articles rust based on the experiment with the test tubes?
What can be inferred about the conditions under which iron articles rust based on the experiment with the test tubes?
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