A student reacts a 5 cm strip of aluminium with dilute hydrochloric acid in a test-tube and collects the hydrogen produced. The strip has been stored in a drawer and its surface is dull and grey because a layer of aluminium oxide has formed on it.
[1 mark] Describe / Explain
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🧭Modelled on Cambridge 0620 · May/Jun 2025 · Paper 62 · Q1(b)