Commodity Fumigation License Practice Exam

Why should hydrogen phosphide never come into contact with water?

1. It enhances its pesticide properties

2. It may cause corrosion

3. Spontaneous combustion or explosion may occur

4. It becomes ineffective

The correct answer is: Spontaneous combustion or explosion may occur

Hydrogen phosphide is a highly toxic gas and reacts extremely violently with water. When it comes into contact with water, it can result in the generation of phosphine gas, which is itself highly flammable and can lead to spontaneous combustion or explosions. This characteristic makes hydrogen phosphide particularly dangerous in situations where moisture is present, as the risk of fire or explosion increases significantly. In fumigation practices, maintaining a controlled environment is crucial for safety and effectiveness. The potential for violent reactions emphasizes the importance of keeping hydrogen phosphide away from any water sources to prevent hazardous situations. Understanding this risk is essential for anyone involved in the handling and application of chemical fumigants.