iGCSE Chemistry 0620 Extended - 9.2 Uses of metals- Exam Style Questions Paper 2- New Syllabus
▶️ Answer/Explanation
Aluminium is extensively utilized to manufacture food containers because it forms a protective, non-reactive oxide layer on its surface that completely resists corrosion by food acids. Car bodies require malleability (not ductility), cutlery requires resistance to rusting over thermal conductivity, and overhead cables strictly require a low density to avoid sagging.
✅ Answer: (C)
✅ Answer: (C)
▶️ Answer/Explanation
Copper’s primary use in electrical wiring is because it has excellent electrical conductivity and is highly ductile, meaning it can be drawn into thin wires without breaking. Option B is wrong because copper and tin make bronze, not brass. Option C is wrong because overhead cables usually use aluminium due to its lower density. Option D is wrong because aluminium, not copper, is typically used for takeaway containers.
✅ Answer: (A)
✅ Answer: (A)
▶️ Answer/Explanation
Let’s evaluate the options: Aluminium is renowned for its remarkably low density compared to transition metals like copper, making option A false. Aluminium is located significantly higher in the reactivity series than copper, making option B false. Copper is an outstanding electrical conductor used worldwide in wiring, ruling out option D. Option C is entirely correct because copper is highly ductile, meaning it can easily be pulled and stretched into thin conducting wires without snapping.
✅ Answer: (C)
✅ Answer: (C)