p-Block elementsHard

Question

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

Options

A.aluminium is a noble metal
B.oxygen forms a protective oxide layer on aluminium surface
C.iron unergoes reaction easily with water
D.iron forms both mono and divalent ions

Solution

2Al + 3H2O →  Al2O3 + 3H2O (slow reaction)
Al2O3 forms protecting oxide layer on Al surface

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