Explain why aluminium resists corrosion but iron does not. Explain the term culling as used in livestock management.
thr
(a)
(ii)
State two methods of preventing iron from rusting
[4 m:
(6)
(i)
(ii)
State three benefits of practising culling
(5 m
172&1/pa/20

The corrosion resistance of aluminum is due to its tendency to form a compact oxide layer over the surface. The oxide formed offers a high resistance to corrosion. The normal surface film present in air is about 1 nm thick.

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