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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, it changes colour when put in acid or base. Like phenolphthalein changes to red colour in base and becomes colourless in acid.

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