Question 22M.2.sl.TZ2.5b
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.sl.TZ2.5b |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Deduce | Question number | b | Adapted from | N/A |
Molten zinc chloride undergoes electrolysis in an electrolytic cell at 450 °C.
Deduce the overall cell reaction including state symbols. Use section 7 of the data booklet.
[2]
ZnCl2 (l) → Zn (l) + Cl2 (g)
balanced equation ✔
correct state symbols ✔
Accept ionic equation.
The performance was weak on this part-question as well. The overall equations did not balance atoms or charges on many of the incorrect answers. For the state symbols, many candidates used the aqueous state symbol, some gave the chloride ion a gaseous state symbol, and some candidates still had a solid zinc product even though they were directed to use the melting point of zinc in the data booklet. 12% of the candidates did not answer the question and the average mark was 0.5 out of 2 marks.
