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Chemistry · Oct / Nov 2025 · Paper 11 · Question 40

5070Identification of ions and gases

A colourless solution of compound W is tested separately with a few drops of aqueous sodium hydroxide and a few drops of aqueous ammonia. No precipitate is observed in either of the tests. What is the cation in W?

  1. AAl3+
  2. BCa2+
  3. CCu2+
  4. DNH4+

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Correct answer: D. NH4+

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