Aluminium is much more reactive than iron because its standard reduction potential is higher than iron. Still aluminium is less easily corroded than iron because: (A) aluminium reacts with atmospheric carbon dioxide to form a self protective layer of Al2O3 (B) it has a higher reducing power and forms a self protective layer of Al2O3 (C) it has a higher reducing power and does not react with oxygen so easily (D) both A and B

The standard reduction potential of aluminium is higher than iron. Hence, it is much more reactive than iron. However, aluminium is still less easily corroded than iron since oxygen forms a protective oxide layer of Al2O3 on its surface. 

Therefore, the answer is ‘it has a higher reducing power and forms a self protective layer of Al2O3. So, the correct option is (B)

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