Acids, Bases and Salts - 2

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Multiple Choice

Which of the following terms correctly represents an indicator?

  1. An indicator is a dye that does not change colour when it is put into an acid or base.
  2. An indicator is a dye that changes colour when it is put into an acid or base.
  3. An indicator is a dye that change colour only when it is put into an acid.
  4. An indicator is a dye that changes colour only when it is put into an base.
  5. None of these
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