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Chemistry · Oct / Nov 2017 · Paper 12 · Question 31

5070Reactivity series

Aluminium is a metal that is often used to make caps for bottles. When thrown away and buried in the soil, the caps do not corrode. Why is this?

  1. AAluminium does not react with acids.
  2. BAluminium does not react with alkalis.
  3. CAluminium is alloyed with other metals.
  4. DAluminium is protected by a layer of oxide.

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Correct answer: D. Aluminium is protected by a layer of oxide.

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