Mark the incorrect statement.

Options

A. CNG and LPG are clean fuels.
B. Petroleum is refined in a petroleum refinery.
C. Petroleum products are called petrochemicals.
D. Coal does not cause any pollution when burnt.

Explanation

To determine the incorrect statement from the provided options, we will analyze each statement one by one.

1. **CNG and LPG are clean fuels.**
- CNG (Compressed Natural Gas) and LPG (Liquefied Petroleum Gas) are known for producing fewer pollutants when burned compared to other fossil fuels. They emit less smoke and harmful gases, making this statement true.

2. **Petroleum is refined in a petroleum refinery.**
- Petroleum is indeed processed in a facility known as a petroleum refinery to convert crude oil into useful products such as gasoline, kerosene, and diesel. This statement is also true.

3. **Petroleum products are called petrochemicals.**
- Petrochemicals are chemical products derived from petroleum. They include a wide range of chemicals used in various applications. This statement is true as well.

4. **Coal does not cause any pollution when burnt.**
- This statement is incorrect. When coal is burned, it releases a significant amount of carbon dioxide and other pollutants, contributing to air pollution and environmental issues. Therefore, this statement is false.

Based on the analysis, the incorrect statement is: **"Coal does not cause any pollution when burnt."**