What is the name given to the indicators giving different odours in acidic and basic medium ?

Explanation

### Step-by-Step Solution:

1. **Understanding Indicators**: Indicators are substances that help us identify whether a solution is acidic or basic. They can change color or produce different odors in response to the pH of the solution.

2. **Types of Indicators**: There are two main types of indicators:
- **Color Indicators**: These change color in acidic or basic environments (e.g., litmus paper).
- **Olfactory Indicators**: These change their smell in acidic or basic environments.

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