Question

Iron nails rust in test tube A but they do not rust in test tubes B and C. What inferences can be drawn from the given observations ?

• A. Presence of water is the only condition for rusting.
• B. Presence of both air and water is necessary for rusting.
• C. Presence of air is the only condition for rusting.
• D. Presence of dry air is the only condition for rusting.

Answer 1

The correct option is B

Presence of both air and water is necessary for rusting.

Presence of moist air is an essential condition for rusting of iron.