O-LevelChemistryAcids, Bases & Salts5070/22 · Oct/Nov 2020 · Q15 Marks
Choose from the following compounds to answer these questions. aluminium sulfate ammonia calcium carbonate carbon dioxide chlorofluorocarbons copper(II) sulfate hydrogen chloride potassium nitrate sodium chloride Each compound may be used once, more than once or not at all. Which compound:
- (a)is a gas which dissolves in water to form an alkaline solution[1]
- (b)is an anhydrous solid which is used to test for water[1]
- (c)contains ions with a 3+ charge[1]
- (d)is a solid used in flue gas desulfurisation[1]
- (e)causes eutrophication?[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [1] 1(a) ammonia
- [1] 1(b) copper(II) sulfate
- [1] 1(c) aluminium sulfate
- [1] 1(d) calcium carbonate
- [1] 1(e) potassium nitrate
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