A-LevelChemistryGroup 179701/12 · Oct/Nov 2025 · Q221 Mark
X and Y are sodium salts of Group 17 elements. When X reacts with concentrated sulfuric acid, hydrogen sulfide, H2S, is produced. When Y reacts with concentrated sulfuric acid, there is no change in the oxidation number of the sulfur. Which statement is correct?
AAqueous X reduces aqueous bromine.
BAqueous Y reacts with aqueous silver nitrate to give a precipitate which is insoluble in concentrated aqueous ammonia.
CX and Y react separately with concentrated sulfuric acid to produce halogens.
DWhen X reacts with concentrated sulfuric acid, six halide ions are needed to reduce one sulfur atom to H2S.
✓ Correct answer
A: Aqueous X reduces aqueous bromine.
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Group 17 and see which topics are most likely to come up next.
Sign up free →