Chemistry · Oct / Nov 2017 · Paper 12 · Question 2
5070Identification of ions and gases
The results of two tests on solution X are shown. | reagent added | observation on adding a few drops of reagent | observation on adding an excess of reagent | |---|---|---| | aqueous sodium hydroxide | white precipitate | precipitate dissolves | | aqueous ammonia | white precipitate | precipitate remains | Which ion is present in solution X?
- AAl³⁺
- BCa²⁺
- CCu²⁺
- DZn²⁺
As printed in the paper
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Correct answer: A. Al³⁺
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