Platinised asbestos is used as a catalyst in the manufacture of `H_(2)SO_(4)`.It is an example of :

Options

A. Homogeneous catalyst
B. Heterogeneous catalyst
C. Auto-catalyst
D. Induced catalyst

Answer

To solve the question regarding platinized asbestos being used as a catalyst in the manufacture of \( H_2SO_4 \), we need to analyze the phases of the reactants, products, and the catalyst involved in the reaction.

### Step-by-Step Solution:

1. **Identify the Reaction**: The question states that platinized asbestos is used as a catalyst in the manufacture of sulfuric acid (\( H_2SO_4 \)). The primary reactant in this process is sulfur dioxide (\( SO_2 \)), which is oxidized to form sulfur trioxide (\( SO_3 \)), which then reacts with water to form sulfuric acid.

2. **Determine the Phases of the Components**:
- **Reactants**: Sulfur dioxide (\( SO_2 \)) is typically in the gaseous state during the reaction.
- **Product**: Sulfuric acid (\( H_2SO_4 \)) is in the liquid state.
- **Catalyst**: Platinized asbestos is a solid catalyst.

3. **Analyze the Phases**:
- The catalyst (platinized asbestos) is in the solid phase.
- The reactants (\( SO_2 \)) are in the gaseous phase.
- The product (\( H_2SO_4 \)) is in the liquid phase.

4. **Classify the Type of Catalyst**: Since the catalyst and the reactants/products are in different phases (solid vs. gas/liquid), this type of catalyst is classified as a **heterogeneous catalyst**. In contrast, if the catalyst were in the same phase as the reactants and products, it would be classified as a **homogeneous catalyst**.

5. **Conclusion**: Based on the analysis, we conclude that platinized asbestos is an example of a heterogeneous catalyst.

### Final Answer:
Platinized asbestos is an example of a **heterogeneous catalyst**.

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