On what basis do olfactory indicators help identify acids and bases?
Answer and explanation
Correct answer: By change in smell
Olfactory indicators are substances whose characteristic smell changes, becomes weak, or is masked in acidic or basic media. This smell response provides evidence about the nature of the tested solution without relying on a colour change. Onion, vanilla essence, and clove are commonly cited school-level examples. Thus option B is correct. Permanent black colour, metal formation, and zero temperature are not the identifying basis of these indicators.
Frequently asked questions
What is the correct answer to this question?
By change in smell
Why is this the correct answer?
Olfactory indicators are substances whose characteristic smell changes, becomes weak, or is masked in acidic or basic media. This smell response provides evidence about the nature of the tested solution without relying on a colour change. Onion, vanilla essence, and clove are commonly cited school-level examples. Thus option B is correct. Permanent black colour, metal formation, and zero temperature are not the identifying basis of these indicators.
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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