NCERT Question 3 - Chapter 5 Class 7 - Acid, Bases and Salt

Last updated at July 30, 2026 by

Name the source from which litmus solution is obtained. What is the use of this solution?

 

Answer:

Litmus solution is obtained from lichens .

A natural dye extracted from lichens is dissolved in distilled water to obtain litmus solution.

It is used as an indicator to distinguish between acids and bases .

  • If the medium is acidic , litmus changes its colour to red .
  • If the medium is basic , litmus changes its colour to blue .
  • If the medium is neutral , there is no change in the colour.

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