Briefly explain : Producer gas

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Producer Gas**: Producer gas is a type of gas that is produced by the gasification of carbonaceous materials, primarily coal or coke, in the presence of limited air or oxygen.

2. **Process of Formation**: The production of producer gas occurs when air is passed over red-hot coke. The high temperature causes a reaction between the coke and the oxygen in the air.

3. **Chemical Reaction**: The main chemical reactions involved in the formation of producer gas are:
- The combustion of carbon in coke with oxygen produces carbon dioxide:
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