Chemistry · Oct / Nov 2020 · Paper 12 · Question 30
Four metals and hydrogen are arranged in order of decreasing reactivity. potassium aluminium zinc hydrogen copper decreasing reactivity Which statement about these elements is correct?
- AAluminium is formed when aluminium oxide is heated with hydrogen.
- BCopper displaces zinc from aqueous zinc sulfate.
- CCopper is formed when copper(II) oxide is heated with hydrogen.
- DWhen added to water, aluminium forms positive ions more readily than potassium forms positive ions.
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Correct answer: C. Copper is formed when copper(II) oxide is heated with hydrogen.
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