Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.

Explanation

To answer the question regarding the catalyst that facilitates the conversion of sulfur dioxide (SO₂) to sulfur trioxide (SO₃) in step C, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reaction**: The conversion of sulfur dioxide (SO₂) to sulfur trioxide (SO₃) is a crucial step in the production of sulfuric acid (H₂SO₄) in the Contact Process.

2. **Determine the Catalyst**: In chemical reactions, a catalyst is a substance that increases the rate of a reaction without being consumed in the process. For the conversion of SO₂ to SO₃, the commonly used catalyst is vanadium pentoxide.

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