Iron rusts but aluminium does not easily corrode. Which statement explains why aluminium does not easily corrode?
A.
It is an alloy.
B.
It is below iron in the reactivity series.
C.
It is a transition element.
D.
Its surface is protected by an oxide layer.
Exam No：0620_m24_qp_22 Year：2024 Question No：31
Answer:
D
Knowledge points:
9.5.1. State the conditions required for the rusting of iron and steel to form hydrated iron(III) oxide
9.5.2. State some common barrier methods, including painting, greasing and coating with plastic
9.5.3. Describe how barrier methods prevent rusting by excluding oxygen or water
9.5.4. Describe the use of zinc in galvanising as an example of a barrier method and sacrificial protection
9.5.5. Explain sacrificial protection in terms of the reactivity series and in terms of electron loss
Solution:
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