Which of the following statements are correct about solid catalyst?

Options

A. Catalyst is requried in equal amount as the reactants present in the reaction.
B. Catalytic activity of a solid catalyst does not depend upon the extent of chemisorption.
C. Desorption is not important for a solid to act as good catalyst
D. Same reactant may give different products by using different catalysts.

Explanation

To determine which statements about solid catalysts are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1:** "Catalyst is required in equal amount as reactant present in the reaction."
- **Analysis:** This statement is incorrect. A catalyst is not consumed in the reaction and does not need to be present in equal amounts to the reactants. It may be required in varying amounts depending on the reaction conditions and the specific catalyst used.
- **Conclusion:** **Statement 1 is wrong.**

2. **Statement 2:** "Catalytic activity of a solid catalyst does not depend upon the extent of chemisorption."
- **Analysis:** This statement is also incorrect. The catalytic activity of a solid catalyst is indeed dependent on the extent of chemisorption. Chemisorption refers to the chemical bonding between the catalyst and the reactants, which is crucial for the catalytic process.
- **Conclusion:** **Statement 2 is wrong.**

3. **Statement 3:** "Desorption is not important for solid to act as a good catalyst."
- **Analysis:** This statement is incorrect as well. Desorption is a vital process for a solid catalyst to function effectively. After the reaction, the products must desorb from the catalyst surface to allow for further catalytic cycles. Without desorption, the catalyst would become saturated and lose its effectiveness.
- **Conclusion:** **Statement 3 is wrong.**

4. **Statement 4:** "Same reactant may give different products by using different catalysts."
- **Analysis:** This statement is correct. Different catalysts can lead to different reaction pathways, resulting in various products from the same reactant. For example, using different catalysts like vanadium pentoxide, nickel, or molybdenum can yield different products from the same starting material.
- **Conclusion:** **Statement 4 is correct.**

### Final Answer:
The only correct statement about solid catalysts is **Statement 4**: "Same reactant may give different products by using different catalysts."

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