Fill in the blanks by choosing the appropriate word/words from those given in the brackets.(dialysis, negative , dispersed phase , dispersion medium , positive , electro-osmosis , coagulation , coagulates, emulsion , gel , gold number , Tyndall effect , protective colloids , electrodialysis)
A catalyst which enhances the rate of the reaction is called a ..................... catalyst while which decreases its speed is called a ...................... catalyst.

Explanation

To solve the question, we need to fill in the blanks with the appropriate terms related to catalysts.

1. **Understanding Catalysts**:
- A catalyst is a substance that alters the rate of a chemical reaction without being consumed in the process.
- Catalysts can either increase or decrease the rate of reaction.

2. **Types of Catalysts**:
- A catalyst that **enhances** the rate of reaction is known as a **positive catalyst**.
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