The gas used in burner in laboratory is

Options

A. producer gas
B. oil gas
C. coal gas
D. gobar gas

Explanation

To determine the gas used in burners in a laboratory, we need to analyze the options provided: producer gas, oil gas, coal gas, and cow dung gas.

### Step-by-Step Solution:

1. **Identify the Options**: The gases mentioned are producer gas, oil gas, coal gas, and cow dung gas. We need to evaluate each one to see which is commonly used in laboratory burners.

2. **Evaluate Producer Gas**:
- Producer gas is primarily used in industrial applications and for generating electricity. It is not typically used in laboratory burners.

3. **Evaluate Oil Gas**:
- Oil gas, also known as Liquefied Petroleum Gas (LPG), is derived from petroleum. It consists mainly of hydrocarbons like propane and butane. This gas is commonly used in laboratory burners due to its efficiency and clean-burning properties.

4. **Evaluate Coal Gas**:
- Coal gas is produced from the gasification of coal and contains carbon monoxide and other gases. While it was historically used for heating and lighting, it is not commonly used in modern laboratory burners due to safety concerns.

5. **Evaluate Cow Dung Gas**:
- Cow dung gas, or biogas, is produced from the anaerobic digestion of organic matter. While it is environmentally friendly and can be used for cooking, it is not typically used in laboratory settings.

6. **Conclusion**: After evaluating all options, the gas that is most commonly used in laboratory burners is oil gas (LPG). Therefore, the correct answer is oil gas.

### Final Answer:
The gas used in burners in the laboratory is **oil gas**.