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Chemistry · May / June 2018 · Paper 11 · Question 3

5070Identification of ions and gases

Tests were carried out on an aqueous solution of an unknown compound, P. The observations are recorded in the table. | test | observation | |---|---| | aqueous sodium hydroxide added | green precipitate, soluble in excess giving a green solution | | dilute nitric acid added then aqueous barium nitrate | white precipitate | | dilute nitric acid added then aqueous silver nitrate | no precipitate | Which ions are present in P?

  1. ACr3+ and Cl–
  2. BCr3+ and SO4 2–
  3. CFe2+ and Cl–
  4. DFe2+ and SO4 2–

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Correct answer: B. Cr3+ and SO4 2–

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