The decomposition of `KCIO_(3)` is catalysed by

Options

A. HCI
B. `MnO_(2)`
C. `C_(2)H_(5)OH`
D. CI

Answer

To solve the question regarding the catalyst for the decomposition of potassium chlorate (KClO₃), we will follow these steps:

### Step 1: Understand the Reaction
The decomposition of potassium chlorate (KClO₃) can be represented by the following chemical equation:
\[ 2 \text{KClO}_3 \rightarrow 2 \text{KCl} + 3 \text{O}_2 \]
This reaction produces potassium chloride (KCl) and oxygen gas (O₂).

### Step 2: Identify the Catalyst
In the presence of a catalyst, the decomposition of KClO₃ occurs at a lower temperature. The catalyst used for this reaction is manganese dioxide (MnO₂).

### Step 3: Explain the Role of the Catalyst
Manganese dioxide (MnO₂) facilitates the decomposition of KClO₃ without being consumed in the reaction. It lowers the activation energy required for the reaction, allowing it to proceed at a significantly lower temperature compared to the non-catalyzed reaction, which requires temperatures around 400°C.

### Step 4: Conclusion
Thus, the catalyst for the decomposition of KClO₃ is:
\[ \text{MnO}_2 \text{ (Manganese Dioxide)} \]

### Summary of the Solution
The decomposition of potassium chlorate (KClO₃) is catalyzed by manganese dioxide (MnO₂).

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