Some bacteria obtain their energy by oxidising sulphur, producing sulphuric acid as a by-product. In the laboratory, or in industry, the first step in the conversion of sulphur to sulphuric acid is to produce sulphur dioxide. The sulphur dioxide is converted to sulphur trioxide, which reacts with water to give sulphuric acid.
Name one catalyst used industrially which speeds up the conversion of sulphur dioxide to sulphur trioxide.

Explanation

To solve the question regarding the catalyst used in the industrial conversion of sulfur dioxide to sulfur trioxide, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process**: The conversion of sulfur to sulfuric acid involves several steps. The first step is the oxidation of sulfur to produce sulfur dioxide (SO₂).

2. **Identify the Next Step**: The sulfur dioxide is then further oxidized to form sulfur trioxide (SO₃). This is a crucial step in the production of sulfuric acid.

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