Rusting of iron is catalysed by which of the following?

Which of the following statements regarding the rusting of iron is incorrect?

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:

Write the chemical formula of rust.

During the corrosion of $Fe$,which species is reduced by the electrons produced due to the oxidation of $Fe$?

Several blocks of magnesium are fixed to the bottom of a ship to