Which of the following substances is an olfactory indicator?
Answer and explanation
Correct answer: Onion
An olfactory indicator is identified through a change in smell rather than a change in colour. Onion is an olfactory indicator because its characteristic smell is affected by the nature of the medium and may be detected differently in acidic and basic conditions. Turmeric, litmus and phenolphthalein are colour indicators; they show changes through colour. Thus, onion, option B, is the correct answer.
Frequently asked questions
What is the correct answer to this question?
Onion
Why is this the correct answer?
An olfactory indicator is identified through a change in smell rather than a change in colour. Onion is an olfactory indicator because its characteristic smell is affected by the nature of the medium and may be detected differently in acidic and basic conditions. Turmeric, litmus and phenolphthalein are colour indicators; they show changes through colour. Thus, onion, option B, is the correct answer.
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.
