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2017 O Level Chem P1 Q8 — Structure and Properties / Metals and Ionic Compounds Solution

Structure and Properties / Metals and Ionic Compounds 2017 O Level Pure Chemistry · Paper 1 · Q8

Question

Which statements are correct for both metals and ionic compounds? 1 They conduct electricity because electrons flow through the solid material. 2 Most have high melting points. 3 They contain positive ions.

A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only

Correct answer: D

Video Solution

Explanation

Answer: D. Statement 2 (most have high melting points) and statement 3 (they contain positive ions) are true of both metals and ionic compounds.

Statement 1 is true only for metals: in a metal the delocalised electrons carry the current through the solid, but an ionic solid does not conduct because its ions are fixed in the lattice (it conducts only when molten or in solution, by moving ions). So 2 and 3 only.

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