Solid sodium bromide is reacted with concentrated sulfuric acid. Which option correctly identifies a gaseous reduction product of the sulfuric acid and the chemical test used to confirm its identity?
Hydrogen bromide (HBrHBrHBr); turns damp blue litmus paper red.
Sulfur dioxide (SO2SO_2SO2); turns acidified potassium dichromate(VI) paper from orange to green.
Hydrogen sulfide (H2SH_2SH2S); turns damp lead(II) ethanoate paper black.
Bromine (Br2Br_2Br2); turns starch paper blue-black.