DP Chemistry (last assessment 2024)
Question 22M.2.hl.TZ1.b(i)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.hl.TZ1.b(i) |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | Deduce | Question number | b(i) | Adapted from | N/A |
b(i).
[Maximum mark: 1]
22M.2.hl.TZ1.b(i)
Nitric acid is usually produced by the oxidation of ammonia.
A mixture of nitric acid and sulfuric acid can be used to convert benzene to nitrobenzene, C6H5NO2.
Write an equation for the reaction between the acids to produce the electrophile, NO2+.
[1]
Markscheme
HNO3 + 2H2SO4 NO2+ + H3O+ + 2HSO4- ✔
Accept “HNO3 + H2SO4 NO2+ + H2O + HSO4-”.
Accept “HNO3 + H2SO4 H2NO3+ + HSO4-” AND “H2NO3+ NO2+ + H2O”.
Accept single arrows instead of equilibrium signs.
Examiners report
Many had difficulties writing the balanced equation(s) for the formation of the nitronium ion.
