Chemistry · May / June 2021 · Paper 12 · Question 4
5070Identification of ions and gases
An aqueous solution of J is a colourless solution that contains cations and chloride ions. Separate samples of the solution give a white precipitate with a few drops of aqueous sodium hydroxide and with a few drops of aqueous ammonia. 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 aqueous barium nitrate are added to an aqueous solution of J, a white precipitate is formed.
- DWhen dilute nitric acid and 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 aqueous silver nitrate are added to an aqueous solution of J, a white precipitate is formed.
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