09-10-2021-1633 - Sulfur Dioxide sulphur dioxide SO2. Double Bond (Two Two bond)

 Sulfur dioxide (IUPAC-recommended spelling) or sulphur dioxide (traditional Commonwealth English) is the chemical compound with the formula SO

2. It is a toxic gas responsible for the smell of burnt matches. It is released naturally by volcanic activity and is produced as a by-product of copper extraction and the burning of sulfur-bearing fossil fuels. Sulfur dioxide has a pungent smell like nitric acid.^{[citation needed]}

^{https://en.wikipedia.org/wiki/Sulfur_dioxide}

^{Above. Preservative stabilizer for plant type tropic. Isotretinoin/Accutane/etc.}