The correct answer is option 3. Aluminium phosphide.
Aluminium phosphide (AlP) is a highly toxic inorganic compound that is commonly used as a pesticide or fumigant for stored cereal grains, such as wheat and rice. It is also utilized as an igniting agent in flares. Here's an explanation of its uses:
1. Pesticide/Fumigant for Cereals: Aluminium phosphide is used to control pests, particularly insects and rodents, in stored grains. When exposed to moisture in the air, aluminium phosphide reacts to release phosphine gas (PH3), which is highly toxic to pests. The gas penetrates the stored grains, killing insects, larvae, and rodents present within the storage area. This method of fumigation helps prevent infestations and preserves the quality of stored grains.
2. Igniting Agent in Flares: Aluminium phosphide is also used as an igniting agent in flares. Flares are signaling devices used in various applications, including marine navigation, aviation, and emergency signaling. Aluminium phosphide can react exothermically with atmospheric moisture to produce phosphine gas, which is highly flammable. In flare compositions, aluminium phosphide contributes to the rapid ignition and sustained burning of the flare, producing a bright and visible flame.
It's worth noting that while aluminium phosphide is effective in pest control and flare compositions, it is also highly toxic to humans and other animals. Handling aluminium phosphide requires careful precautions to prevent accidental exposure, and its use as a pesticide is strictly regulated to ensure safety for both applicators and consumers of treated grains. Additionally, appropriate disposal methods are necessary to minimize environmental contamination and potential hazards associated with its use. |
