O-LevelChemistryAcids, Bases & Salts5070/21 · May/June 2023 · Q16 Marks
Choose from the following oxides to answer the questions. Al2O3 CO CO2 CaO Fe2O3 H₂O Na₂O SO2 SiO2 Each oxide may be used once, more than once or not at all. State which oxide:
- (a)is a solid made during the thermal decomposition of limestone in the blast furnace[1]
- (b)reacts with both acids and alkalis[1]
- (c)has a giant covalent structure[1]
- (d)has an ion with an oxidation number of +2[1]
- (e)turns white anhydrous copper(II) sulfate blue[1]
- (f)is made during the fermentation of aqueous glucose to make ethanol.[1]
Mark scheme
Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.
- 1(a) CaO (1)
- 1(b) Al2O3 (1)
- 1(c) SiO2 (1)
- 1(d) CaO (1)
- 1(e) H2O (1)
- 1(f) CO2 (1)
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