O-LevelChemistryAcids, Bases & Salts5070/21 · May/June 2020 · Q15 Marks
Choose from the following oxides to answer the questions. calcium oxide carbon monoxide copper(II) oxide nitrogen dioxide nitrogen monoxide silicon dioxide sulfur dioxide water zinc oxide Each oxide may be used once, more than once or not at all. Which oxide:
- (a)is used as a food preservative[1]
- (b)is amphoteric[1]
- (c)has a molecule that contains only 15 protons[1]
- (d)has a high melting point because it has a giant covalent structure[1]
- (e)reacts with dilute sulfuric acid to make a blue solution?[1]
Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [1] sulfur dioxide
- [1] zinc oxide
- [1] nitrogen monoxide
- [1] silicon dioxide
- [1] copper(II) oxide
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