Litmus is obtained from which source?
Answer and explanation
Correct answer: Lichens
The governing concept is the origin of natural acid-base indicators. Litmus is a dye mixture obtained from lichens, organisms formed through a close association between a fungus and a photosynthetic partner. It is processed into litmus paper, which changes colour in acidic and basic solutions. Therefore option A, lichens, is correct. Rose petals can provide other natural colour indicators, but they are not the standard source of litmus; neem and wheat are unrelated to litmus production.
Frequently asked questions
What is the correct answer to this question?
Lichens
Why is this the correct answer?
The governing concept is the origin of natural acid-base indicators. Litmus is a dye mixture obtained from lichens, organisms formed through a close association between a fungus and a photosynthetic partner. It is processed into litmus paper, which changes colour in acidic and basic solutions. Therefore option A, lichens, is correct. Rose petals can provide other natural colour indicators, but they are not the standard source of litmus; neem and wheat are unrelated to litmus production.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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