When solid sodium iodide is treated with concentrated sulfuric acid, a mixture of gaseous and solid products is formed. One of the gaseous products is highly toxic and characterized by its distinct smell of rotten eggs. What is the chemical formula of this gas?
SO2\text{SO}_2SO2
H2S\text{H}_2\text{S}H2S
HI\text{HI}HI
I2\text{I}_2I2