What is a Selenium dioxide (SeO₂)?

Selenium dioxide (SeO₂) is an oxide of selenium, appearing as a white to pale yellow crystalline solid. It is soluble in water and hygroscopic, readily absorbing moisture from the air. Selenium dioxide is primarily used as an oxidizing agent in organic synthesis, notably for converting alcohols into aldehydes. It is also known for its application in glass manufacturing, where it serves to decolorize glass by neutralizing the greenish tint caused by iron impurities. Additionally, SeO₂ is used in photographic materials and semiconductor production. Due to its toxicity, it must be handled with caution—exposure can cause irritation or poisoning through inhalation or skin contact. Proper storage involves keeping it in airtight containers away from moisture. In the environment, selenium dioxide can be harmful to living organisms, and waste disposal must follow strict regulations. Its high reactivity and specialized uses make it a valuable compound in both industrial and research applications.

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