Briefly explain : Water gas

Explanation

**Step-by-Step Solution:**

1. **Definition of Water Gas**: Water gas is a type of fuel gas that is produced from the reaction of steam with carbon.

2. **Process of Formation**: To produce water gas, super-heated steam is passed over red-hot coke (a form of carbon).

3. **Chemical Reaction**: The chemical reaction that occurs can be summarized as follows:
- The carbon (from coke) reacts with the steam (H2O) to produce carbon monoxide (CO) and hydrogen gas (H2).
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