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Q66 (NDA-I/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology) Official Key

Litmus, a well-known acid-base indicator, is derived from :

Explanation

Litmus is a widely used natural acid-base indicator that is extracted from lichens. Lichens are unique composite organisms consisting of a symbiotic association between a fungus and an alga (or cyanobacterium).

  • Source: The dye is primarily obtained from various species of lichens, such as Roccella tinctoria and Lecanora tartarea.
  • Function: It is used to determine the acidity or alkalinity of a substance. In its neutral state (distilled water), litmus has a mauve (purple) color.
  • Chemical Reaction: When exposed to an acidic solution, litmus turns red. Conversely, when exposed to a basic (alkaline) solution, it turns blue.

As per NCERT Science standards, litmus is the most commonly used natural indicator, typically available either as a solution or in the form of paper strips (litmus paper).

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SIMILAR QUESTIONS

CDS-I · 2022 · Q26 Relevance score: -1.28

Which one of the following living organisms gives litmus ?

NDA-II · 2009 · Q88 Relevance score: -1.95

Acid turns blue litmus red and base turns red litmus blue. A student tested a liquid with a red litmus paper which remained red with no change. This shows that the liquid

NDA-II · 2011 · Q29 Relevance score: -2.81

Bases turn red litmus blue and acids turn blue litmus red. A student tested a liquid with a red litmus paper and it stayed red with no change. This shows that the liquid

CDS-II · 2021 · Q7 Relevance score: -4.54

Which of the following statements about universal indicator is/are true ? 1. It is a mixture of several indicators. 2. It shows different colours at different concentrations of hydrogen ions in solution. 3. It helps to determine the strength of given acid and base in titration. Select the correct answer using the code given below :

NDA-II · 2023 · Q90 Relevance score: -4.56

What is the action of litmus on ethanol ?