Which statement best describes an olfactory indicator?
A substance that changes smell in acids and bases
Correct Answer: A substance that changes smell in acids and bases
An olfactory indicator is a substance whose odour (smell) changes in acidic or basic medium.
Examples:
- Onion: Pungent smell in neutral; smell disappears in basic solution
- Vanilla essence: Pleasant smell; smell disappears in basic medium
- Clove oil: Smell changes in acidic/basic medium
Olfactory indicators are used by people with colour blindness who cannot use colour-change indicators like litmus.
Similar Questions
Which of the following statements are correct in relation to the extraction of metals? The metals which lie high in the reactivity series are extracted by the electrolysis of molten ore.
The metals of medium reactivity series exist as sulphides and carbonates in nature. It is easier to extract a metal from its sulphide in comparison to oxides.
What happens when acid is dissolved in water?
The molecular mass of carbon dioxide is:
In electrolytic refining, the impure metal is used as which of the following?
Which of the following 'indicators' is used to test the nature of solutions besides litmus paper?
A sample of brass is melted and poured into a mold to make a musical instrument. Which of the following correctly explains why brass is classified as a homogeneous mixture?
What is the purpose of enrichment of ore before extraction?
Which of the following statements best explains why dry HCl gas does NOT change the colour of dry litmus paper, but aqueous HCl does?
Which of the following is NOT a property associated with compounds?
Which of the following is a correct statement about molecules of elements?
Important Questions from Basic Concepts of Chemistry
Which of the following pair is correct?
I. Isotopes – different mass numbers
II. Isobars – different atomic numbers
Which of the following is a zone of a flame?
I. Dark
II. Luminous
III. Non-Luminous
Sphalerite is an ore of:
If formula of sodium salt of an anion X is \(Na_2X\) , then the formula of its aluminium salt would be
Which of the following set contains same number of molecules?
A. 1 gram O 2, 2 grams SO 2
B. 1 gram CO 2, 1 gram N 2O
C. 1 gram O 2, 1 gram O 3
