21Group 7 HalogensHard1 mark
When concentrated sulfuric acid is added to crystals of sodium bromide, the products include a
colourless gas and a brown-coloured substance.
The colourless gas gives a cream precipitate with AgNO(aq).
Which row describes the reactions that produce the colourless gas and the brown-coloured
substance?
| reaction that produces colourless gas | reaction that produces brown-coloured substance | |
|---|---|---|
| A | acid–base | acid-base |
| B | acid-base | redox |
| C | redox | acid-base |
| D | redox | redox |