Which is the most effective method to protect the hull of a ship made of iron?

Rusting of iron is catalysed by which of the following?

The standard electrode potentials are given as:
$E^o_{Fe^{+2}/Fe} = -0.44 \, V$ and $E^o_{H^{+}/O_2/H_2O} = 1.23 \, V$
Calculate the $E^o_{cell}$ for the corrosion process: ............. $V$

In the galvanizing process,iron is coated with zinc. The resulting chemical protection is most similar to that provided when

Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because

On the basis of the electrochemical theory of aqueous corrosion,the reaction occurring at the cathode is