Which fumigant reacts with water to form a gas?

Prepare for the Qualified Applicator License (QAL) Category M – Non-Soil Fumigation Test. Study with flashcards and multiple-choice questions. Dive deep into each topic with hints and explanations. Ace your exam with confidence!

Magnesium phosphide is the correct answer because it reacts with moisture in the air or water to release phosphine gas, which is a toxic gas used for fumigation. This reaction occurs when magnesium phosphide comes into contact with water, making it effective for pest control in grain storage and other applications where a solid fumigant can produce a gas upon exposure to moisture. This unique property makes magnesium phosphide different from the other options listed.

Phosphine is a gas at room temperature and is produced from the reaction of magnesium phosphide with moisture. However, phosphine itself does not undergo a chemical reaction with water to form itself; it is the result of the reaction from magnesium phosphide. Sulfuryl fluoride and chloropicrin do not react with water to release a gas; instead, they are pre-existing gases used as fumigants without the need for a chemical reaction to occur upon contact with water. Therefore, magnesium phosphide is distinct for generating a gas through its interaction with water.

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