Chemistry · Oct / Nov 2025 · Paper 12 · Question 39
5070Identification of ions and gases
Solid J contains cations and chloride ions. The aqueous solution of J is colourless. Two separate samples of the solution are tested. Aqueous sodium hydroxide added to the first sample produces a white precipitate. Aqueous ammonia added to the second sample produces a white precipitate. Which statement about J is correct?
- AThe cation in J must be Al3+.
- BThe cation in J must be Fe2+.
- CWhen dilute nitric acid and then aqueous barium nitrate are added to an aqueous solution of J, a white precipitate is formed.
- DWhen dilute nitric acid and then aqueous silver nitrate are added to an aqueous solution of J, a white precipitate is formed.
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Correct answer: D. When dilute nitric acid and then aqueous silver nitrate are added to an aqueous solution of J, a white precipitate is formed.
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