O-LevelChemistryMetals & Reactivity5070/22 · May/June 2023 · Q16 Marks
Choose from the following oxides to answer the questions. CO CO2 CaO CuO Fe2O3 H₂O SO2 SiO2 ZnO Each oxide may be used once, more than once or not at all. State which oxide:
- (a)is neutral[1]
- (b)reacts with calcium oxide to form slag in the blast furnace[1]
- (c)reacts with warm dilute hydrochloric acid to give a blue coloured solution[1]
- (d)is amphoteric[1]
- (e)contains an ion with an oxidation number of +3[1]
- (f)decolourises acidified aqueous potassium manganate(VII).[1]
Mark scheme
Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.
- 1(a) H2O (1)
- 1(b) SiO2 (1)
- 1(c) CuO (1)
- 1(d) ZnO (1)
- 1(e) Fe2O3 (1)
- 1(f) SO2 (1)
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