In which of the following will the corrosion of iron be most rapid?

Options

A. In air and saline water
B. In air and moisture
C. In pure oxygen
D. In pure water

Answer

A

Explanation

Oxygen gas and water must be present for iron to rust. Corrosion usually occurs faster near the sea, because droplets of water in the air contain dissolved salts such as sodlim chloride, forming an ionic solution that conducts electricity better than pure water does.