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‘Litmus’, a natural dye is obtained from _______.
1. Beetroot
2. Blue berries
3. Lichen
4. China rose

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Correct Answer - Option 3 : Lichen

The correct answer is Lichen.

  • Litmus
    • Litmus Paper is a type of pH paper made by treating the paper with natural dyes from lichens.
    • It is used to identify whether a solution is acidic, basic, or neutral.
    • The litmus test is performed by placing a small drop of sample onto the colored paper.
    • Usually litmus paper is either red or blue. Red paper turns blue when the pH is alkaline, while blue paper turns red when the pH turns acidic.
    • While litmus paper is most often used to test the pH of liquids, it can also be used to test gases if the paper is dampened with distilled water before exposure to the gas.

  • China Rose is a natural indicator and is used to identify the acidic or basic nature of a solution.
  • China Rose in acidic solutions turns to dark pink or magenta color and in basic solutions to green color. 

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