Chemistry · Oct / Nov 2022 · Paper 12 · Question 3
5070Identification of ions and gases
The following tests are carried out on a sample of green crystals. The crystals are dissolved in water and the resulting solution is divided into two portions. ● Aqueous sodium hydroxide is added to the first portion. A green precipitate, soluble in excess aqueous sodium hydroxide, is formed. The solution formed is heated and a gas is produced which turns litmus paper blue. ● Dilute nitric acid is added to the second portion followed by aqueous barium nitrate. A white precipitate is formed. Which three ions are present in the green crystals?
- Aammonium, chromium(III), sulfate
- Bammonium, iron(II), sulfate
- Cchromium(III), carbonate, sulfate
- Diron(II), nitrate, sulfate
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Correct answer: A. ammonium, chromium(III), sulfate
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