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Chemistry · May / June 2023 · Paper 11 · Question 22

5070Group I properties

Sodium, potassium and rubidium are in Group I of the Periodic Table. Chlorine, bromine and iodine are in Group VII. Which statement is correct?

  1. ABromine displaces chlorine from an aqueous solution of sodium chloride.
  2. BIodine is discharged at the negative electrode when concentrated aqueous potassium iodide is electrolysed.
  3. CRubidium has a greater tendency to form positive ions than potassium.
  4. DSodium and potassium both react with water but the reaction is more violent with sodium.

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Correct answer: C. Rubidium has a greater tendency to form positive ions than potassium.

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