Which row correctly describes the trend in boiling points down Group 7, the explanation for this trend, and the appearance of the respective halogen at room temperature and pressure (298 K, 100 kPa)?
Trend: Decreases | Reason: Weaker permanent dipole-dipole attractions | Appearance: Fluorine is a pale green gas
Trend: Increases | Reason: Stronger covalent bonds | Appearance: Bromine is a red-brown liquid
Trend: Increases | Reason: Stronger van der Waals forces between molecules due to more electrons | Appearance: Iodine is a grey-black solid
Trend: Decreases | Reason: Decreasing electronegativity down the group | Appearance: Chlorine is a pale yellow gas
106 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.