DP Chemistry (last assessment 2024)
Question 22M.2.hl.TZ1.6b(i)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.hl.TZ1.6b(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.TZ1.6b(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.
(b(i))
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.
