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2017 O Level Chem P1 Q28 — Metals / Alloys Solution

Metals / Alloys 2017 O Level Pure Chemistry · Paper 1 · Q28

Question

Duralumin is an aluminium alloy that contains copper. Which statement about duralumin is correct?

AIt contains aluminium and copper that are chemically combined.
BIt contains mobile electrons.
CIt has a lattice of oppositely charged aluminium ions and copper ions.
DIt has the same melting point as copper.

Correct answer: B

Video Solution

Explanation

Answer: B. Duralumin is an alloy, a mixture of metals, so it keeps the metallic structure with mobile (delocalised) electrons.

A is wrong (the metals are mixed, not chemically combined). C is wrong (both are metal ions of the same sign, not oppositely charged). D is wrong (an alloy does not have the same melting point as pure copper).

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