Write the conditions to maximise the yield of `H_2SO_4` by contact process.

Explanation

To maximize the yield of H₂SO₄ (sulfuric acid) by the contact process, we need to consider the reactions involved and the conditions that favor the formation of the desired products. The contact process consists of the following key steps:

1. **Formation of Sulfur Dioxide (SO₂)**:
\[ \text{S (s) + O}_2 \text{(g) } \rightarrow \text{SO}_2 \text{(g)} \]

2. **Formation of Sulfur Trioxide (SO₃)**:
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