Mention the favourable conditions for the manufacture of sulphuric acid by contact process.

Explanation

To manufacture sulfuric acid (H₂SO₄) using the contact process, several favorable conditions must be established to optimize the reaction and yield. Here’s a step-by-step solution outlining these conditions:

### Step 1: Temperature
- **Favorable Condition**: The reaction should be conducted at a temperature of around **720 Kelvin**.
- **Reason**: This temperature is optimal for the conversion of sulfur dioxide (SO₂) to sulfur trioxide (SO₃), which is a key step in the production of sulfuric acid. Higher temperatures may favor the reverse reaction, reducing yield.

### Step 2: Pressure
- **Favorable Condition**: The process should be carried out at a pressure of approximately **2 bar**.
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