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2022 O Level Chem P1 Q29 — Metals / Recycling Solution

Metals / Recycling 2022 O Level Pure Chemistry · Paper 1 · Q29

Question

What should be considered when deciding whether to extract a metal from its ore or recycle the metal? 1 the amount of raw materials used in each process. 2 the cost of each process. 3 the amount of carbon dioxide produced in each process.

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

Correct answer: A

Video Solution

Explanation

Answer: A. The decision to extract a metal from its ore vs. recycle scrap metal is multi-factor. All three considerations in the question are valid:

(1) Raw materials used — extraction consumes ore, energy and reducing agents; recycling reuses metal that's already been extracted. ✓
(2) Cost of each process — extraction is generally more expensive (mining, transport, smelting); recycling typically cheaper. Economics matters. ✓
(3) \(\text{CO}_2\) emissions — extraction (especially in blast furnaces) produces large amounts of \(\text{CO}_2\); recycling produces less. Environmental impact matters. ✓

All three are correct → option A (1, 2 and 3).

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