Onion juice is an example of which type of indicator?
Answer and explanation
Correct answer: Olfactory indicator
Onion juice is classified as an olfactory indicator because onion’s characteristic smell can change or become difficult to detect in different acid-base media. The indicator property is therefore sensed through smell rather than through a typical colour transition. Option A is correct. Onion juice is not a metal, radioactive, or temperature-only indicator; those descriptions do not explain its use in acid-base testing.
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What is the correct answer to this question?
Olfactory indicator
Why is this the correct answer?
Onion juice is classified as an olfactory indicator because onion’s characteristic smell can change or become difficult to detect in different acid-base media. The indicator property is therefore sensed through smell rather than through a typical colour transition. Option A is correct. Onion juice is not a metal, radioactive, or temperature-only indicator; those descriptions do not explain its use in acid-base testing.
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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