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GK QUESTION#3198

Which of the following are examples of synthetic indicators in chemistry? I. Methyl orange II. Phenolphthalein

  1. AOnly I
  2. BOnly II
  3. CBoth I and IICorrect answer
  4. DNeither I nor II
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Answer

C. Both I and II

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Explanation

Methyl orange and phenolphthalein are both synthetic acid–base indicators. Their colour changes occur over characteristic pH intervals. Litmus and turmeric are examples of naturally derived indicators, so both I and II are correct.

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