CAPE Chemistry Unit 2 · 2017 · Paper 1 · Question Q34

Item 34 refers to the following test for pollutants on a sample of water. What is the MOST appropriate inference based on the above observation?

1. (A)\text{Pb}^{2+} ions present
2. (B)\text{PO}_4^{3-} ions present
3. (C)\text{NO}_3^- ions present
4. (D)\text{CN}^- ions present

This question uses a figure or table from the paper — you'll see it when you practise.