What is the chemical reason why an oiled iron object rusts less?
Answer and explanation
Correct answer: Oil reduces contact with air and moisture
Rusting requires electrochemical oxidation of iron in the presence of oxygen and water. A continuous oil film covers the iron and acts as a barrier, reducing the access of humid air to the metal surface. With less oxygen and moisture reaching the iron, the oxidation current and rust formation decrease. Hence option A is correct; oil does not transmute iron, convert rust to water, or increase oxygen supply.
Frequently asked questions
What is the correct answer to this question?
Oil reduces contact with air and moisture
Why is this the correct answer?
Rusting requires electrochemical oxidation of iron in the presence of oxygen and water. A continuous oil film covers the iron and acts as a barrier, reducing the access of humid air to the metal surface. With less oxygen and moisture reaching the iron, the oxidation current and rust formation decrease. Hence option A is correct; oil does not transmute iron, convert rust to water, or increase oxygen supply.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
