Aluminium is more reactive than $Fe$. But $Al$ is less easily corroded than iron because

Rusting of iron is catalyzed by which of the following?

Given below are two statements:
Statement $I$: Corrosion is an electrochemical phenomenon in which pure metal acts as an anode and impure metal as a cathode.
Statement $II$: The rate of corrosion is more in alkaline medium than in acidic medium.
In the light of the above statements,choose the correct answer from the options given below:

The factors affecting corrosion are

Galvanization is applying a coating of:

Iron pipes lying under acidic soil are often attached to blocks of magnesium for protection from rusting. Magnesium offers protection to iron against corrosion because it