Olfactory Indicators
Olfactory Indicators
Olfactory indicators:
There are substances like onion juice, vanilla essence and clove oil which by change of their smell indicate whether the sample solution is acidic or basic. These are called olfactory indicators.
Which of the following are correct : (a) Clove oil gives different smells with acidic and basic solutions. (b) When a basic solution is similarly treated, the smell of the vanilla essence disappears. (c) When 1—2 drops of vanilla essence are added to 1 ml of an acidic solution taken in a test tube, the smell of the vanilla essence change. | |||
| Right Option : A | |||
| View Explanation | |||
The substances whose odour changes in an acidic or basic media are called _________________. | |||
| Right Option : C | |||
| View Explanation | |||
When 1—2 drops of vanilla essence are added to 1 ml of an ____________________ taken in a test tube, the smell of the vanilla essence does not change. | |||
| Right Option : A | |||
| View Explanation | |||
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