Raw material used in formation of producer gas is
(a) Saw dust and wood chips
(b) Crops residue
(c) Agroindustry wasted
(d) All the above

Options

A. Saw dust and wood chips
B. Crops residue
C. Agroindustry wasted
D. All the above

Answer

To determine the raw materials used in the formation of producer gas, we can analyze the options provided:

1. **Understanding Producer Gas**:
- Producer gas is a mixture of gases that primarily consists of carbon monoxide, hydrogen, carbon dioxide, and nitrogen. It is produced by the gasification of carbonaceous materials in the presence of air and controlled moisture.

2. **Evaluating the Options**:
- **Option (a)**: Saw dust and wood chips
- These are organic materials that can be gasified to produce producer gas. They are rich in carbon and can be effectively used in the gasification process.
- **Option (b)**: Crops residue
- Crop residues, such as straw and husks, are also carbonaceous materials that can be used to produce producer gas through gasification.
- **Option (c)**: Agroindustry waste
- Agroindustry waste includes various by-products from agricultural processing, which can also be gasified to generate producer gas.
- **Option (d)**: All the above
- Since all the materials listed in options (a), (b), and (c) can be used to produce producer gas, this option suggests that all the previous options are correct.

3. **Conclusion**:
- Since sawdust, wood chips, crop residues, and agroindustry waste can all be utilized in the formation of producer gas, the correct answer is **(d) All the above**.

### Final Answer:
(d) All the above