What is hydroselenic acid formula?

The formula for hydroselenic acid is H2Se. It is a colorless gas with a pungent odor and is highly toxic. The acid is formed by the reaction of selenium and hydrogen, and it is a stronger acid than hydrogen sulfide. It is also a weaker acid than hydrochloric acid and nitric acid but stronger than acetic acid. Hydroselenic acid can be used in various applications including as a reducing agent and as a precursor to various selenium compounds. It should be handled with extreme care due to its toxicity and flammability.