H2SeO4, known as selenic acid, is a strong mineral acid derived from selenium. It is a colorless, oily liquid that is highly soluble in water and can release toxic fumes when heated. Selenic acid is used in various applications, including the production of selenides and as a reagent in chemical synthesis. This compound is similar in structure to sulfuric acid, with selenium replacing the sulfur atom. Due to its strong oxidizing properties, H2SeO4 can react with many organic and inorganic substances, making it valuable in laboratories and industrial processes. Safety precautions are essential when handling this acid due to its corrosive nature.