Which is false for catalyst?

Options

A. A catalyst can initiate a reaction
B. It does not alter the position of equilibrium in a reversible reaction
C. A catalyst remains unchanged in quality and composition at the end of reaction
D. Catalysts are sometimes very specific in respect of a reaction

Answer

To determine which statement about catalysts is false, we can analyze the properties and functions of catalysts in chemical reactions. Here’s a step-by-step breakdown:

### Step 1: Understand the Role of Catalysts
Catalysts are substances that increase the rate of a chemical reaction without being consumed in the process. They provide an alternative pathway for the reaction, which has a lower activation energy.

**Hint:** Remember that catalysts are not consumed in the reaction and can be reused.

### Step 2: Analyze the Statements
1. **Catalysts increase the rate of chemical reactions.**
This statement is true. Catalysts indeed increase the rate of both forward and backward reactions.

2. **Catalysts are consumed in the reaction.**
This statement is false. Catalysts are not consumed; they remain unchanged after the reaction.

3. **Catalysts can alter the position of equilibrium.**
This statement is true. While catalysts do not change the position of equilibrium, they help the system reach equilibrium faster.

4. **Catalysts can initiate a reaction.**
This statement is false. Catalysts do not initiate reactions; they only speed up reactions that are already occurring.

### Step 3: Identify the False Statement
From the analysis, the false statement regarding catalysts is that they can initiate a reaction. Catalysts cannot start a reaction; they only facilitate it.

### Conclusion
The false statement about catalysts is: "Catalysts can initiate the reaction."

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