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Chemistry · May / June 2020 · Paper 11 · Question 15

5070Identification of ions and gases

An aqueous solution contains 0.01 mol of Zn2+(aq) and 0.01 mol of Cu2+(aq). Aqueous sodium hydroxide is added until in excess. After shaking, the mixture is filtered. What remains on the filter paper?

  1. A0.01 mol of a white hydroxide and 0.01 mol of a blue hydroxide
  2. B0.01 mol of a white hydroxide
  3. C0.01 mol of a blue hydroxide
  4. Dno solid residue

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Correct answer: C. 0.01 mol of a blue hydroxide

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