O-LevelChemistryAcids, Bases & Salts5070/12 · Oct/Nov 2022 · Q31 Mark
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
✓ Correct answer
A: ammonium, chromium(III), sulfate
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