What is water gas? How it is prepared?

Explanation

### Step-by-Step Solution:

1. **Definition of Water Gas**:
Water gas is defined as an equimolar mixture of hydrogen gas (H₂) and carbon monoxide (CO). This means that it contains equal amounts of both gases.

2. **Preparation of Water Gas**:
- The preparation of water gas involves a chemical reaction where steam (H₂O) is passed over hot coke (carbon).
- The reaction can be represented as:
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