O-LevelChemistryStoichiometry5070/11 · Oct/Nov 2011 · Q31 Mark

Oxygen was prepared from hydrogen peroxide, with manganese(IV) oxide as catalyst. The oxygen was collected as shown in the diagram. 2H₂O₂ → 2H₂O + O₂ The first few tubes of gas were rejected because the gas was contaminated by

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Ahydrogen.

Bhydrogen peroxide.

Cnitrogen.

Dwater vapour.

✓ Correct answer

C: nitrogen.

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2011 Paper 1 Variant 1, question 3.

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