Bromine water is added to sodium astatide solution and a displacement reaction takes place.
Statement 1: the bromine molecules are reduced
Statement 2: each astatide ion loses one electron
Statement 3: the half equation for the astatide ions is 2At−+2e−→At2\mathrm{2At^{-} + 2e^{-} \rightarrow At_{2}}2At−+2e−→At2
Statement 4: the sodium ions are oxidised
Which statements are correct?
1 and 2 only
1 and 3 only
2 and 4 only
1, 2 and 3 only
41 exam-style questions on Edexcel GCSE Chemistry 7.2 Group 7, covering 7.2.1 Physical properties of the halogens, 7.2.2 Reactions of the halogens, 7.2.3 Relative reactivity and displacement reactions of the halogens, and 7.2.4 Halogen displacement as a redox reaction. Each one has a worked solution and a mark scheme showing where the marks go.