An iron grill is kept for one week under different conditions. Under which condition is it most likely to rust?
Answer and explanation
Correct answer: In moist air
Rusting is a corrosion process in which iron is slowly oxidised in the presence of oxygen and water. Moist air supplies both necessary conditions at the surface of the grill, so rust is most likely to form there. Dry oxygen lacks moisture, and oxygen-free water lacks the oxidising gas needed for ordinary rusting. Carbon dioxide alone does not provide the complete required conditions. Thus option C is correct.
Frequently asked questions
What is the correct answer to this question?
In moist air
Why is this the correct answer?
Rusting is a corrosion process in which iron is slowly oxidised in the presence of oxygen and water. Moist air supplies both necessary conditions at the surface of the grill, so rust is most likely to form there. Dry oxygen lacks moisture, and oxygen-free water lacks the oxidising gas needed for ordinary rusting. Carbon dioxide alone does not provide the complete required conditions. Thus option C is correct.
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.
