In the following reaction ,MnO2 acts as a catalyst
`2KCL0_3rarr 2KCL+3O_2`
Which of the following is the correct option?

Options

A. Amount of `MnO_2` remains constant
B. `MnO_2` gets totally consumed in the reaction
C. Some amount of `MnO_2` is consumed in the reaction
D. `MnO_2` has no role

Answer

To solve the question regarding the role of MnO2 in the reaction `2KClO3 → 2KCl + 3O2`, we need to analyze the behavior of catalysts in chemical reactions.

### Step-by-Step Solution:

1. **Understanding the Role of a Catalyst**:
- A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. This means that the catalyst is not consumed in the reaction.

2. **Analyzing the Given Reaction**:
- In the reaction `2KClO3 → 2KCl + 3O2`, MnO2 is mentioned as a catalyst. This implies that it will help in facilitating the reaction between potassium chlorate (KClO3) to produce potassium chloride (KCl) and oxygen gas (O2).

3. **Evaluating the Options**:
- **Option 1**: "The amount of MnO2 remains constant."
- This is true because a catalyst does not get consumed in the reaction. The initial amount of MnO2 used will be the same after the reaction.
- **Option 2**: "MnO2 gets totally consumed."
- This is false because catalysts are not consumed in the reaction.
- **Option 3**: "Some amount of MnO2 is consumed in the reaction."
- This is also false for the same reason; catalysts are not consumed.
- **Option 4**: "MnO2 has no role."
- This is incorrect because MnO2 plays a crucial role in facilitating the reaction by changing its rate.

4. **Conclusion**:
- Based on the analysis, the correct option is **Option 1**, which states that the amount of MnO2 remains constant.

### Final Answer:
The correct option is **Option 1**: The amount of MnO2 remains constant.