Chlorine dioxide is a chemical compound with the formula ClO2. It is a yellowish-green gas at room temperature and is commonly used as a disinfectant and bleaching agent. Chlorine dioxide is effective in killing bacteria, viruses, and other pathogens, making it useful in water treatment and sanitation processes. In addition to its disinfectant properties, chlorine dioxide is also used in various industrial applications, such as pulp and paper production. It is important to handle chlorine dioxide with care, as it can be hazardous in concentrated forms and may pose health risks if not used properly.