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
Practise Edexcel GCSE Chemistry Group 7 with exam-style questions for Foundation and Higher tier. 87 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.