The number of liquid fuels among the following is Petrol, LPG, CNG, coal, diesel, spirit, biogas

Explanation

To determine the number of liquid fuels among the given options (Petrol, LPG, CNG, Coal, Diesel, Spirit, Biogas), we will categorize each fuel type based on its physical state (liquid, gas, or solid).

### Step-by-Step Solution:

1. **Identify the Fuels**: List the fuels provided in the question:
- Petrol
- LPG
- CNG
- Coal
- Diesel
- Spirit
- Biogas

2. **Categorize Each Fuel**:
- **Liquid Fuels**:
- **Petrol**: This is a liquid fuel commonly used in vehicles.
- **Diesel**: Another liquid fuel used in diesel engines.
- **Spirit**: Often refers to alcohol-based fuels, which are also liquid.
- **Gas Fuels**:
- **LPG (Liquefied Petroleum Gas)**: This is a gas that can be liquefied under pressure.
- **CNG (Compressed Natural Gas)**: This is a gas that is compressed for storage and transport.
- **Biogas**: This is a gas produced from organic matter.
- **Solid Fuels**:
- **Coal**: This is a solid fuel used for combustion.

3. **Count the Liquid Fuels**: From the categorization:
- The liquid fuels identified are Petrol, Diesel, and Spirit.
- Therefore, there are **3 liquid fuels**.

### Final Answer:
The number of liquid fuels among the given options is **3** (Petrol, Diesel, Spirit).

---