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Litmus, used as an indicator for acids and bases, is extracted from

  • A.Lichens
  • B.Virus
  • C.Plants
  • D.Bacteria

Answer: A

Correct answer: Lichens

Litmus is extracted from lichens, chiefly Roccella species. It turns red in acid and blue in alkali, and was one of the earliest chemical indicators - used long before anyone understood why it worked.

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