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Chemistry · May / June 2026 · Paper 11 · Question 40

5070Identification of ions and gases

J is an aqueous solution. When aqueous sodium hydroxide is added to J, a green precipitate is formed. The resulting mixture is heated, and no gas is formed. Aluminium foil is added to the warmed mixture. A gas is formed that turns damp red litmus paper blue. Which ions does J contain?

  1. AFe3+ and NH4+
  2. BFe3+ and NO3–
  3. CFe2+ and NH4+
  4. DFe2+ and NO3–

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Correct answer: D. Fe2+ and NO3–

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