A student investigates the trends in properties and chemical reactions of the Group 7 elements. An aqueous solution of bromine is added to an aqueous solution of potassium iodide, KI(aq)KI(aq)KI(aq), in a test tube. Cyclohexane is then added, the mixture is shaken, and it is allowed to settle into two distinct layers as shown below.
Which option correctly describes the trend in oxidising ability down Group 7, and the final colour of the upper organic layer in this experiment?
Trend in oxidising ability: increases; Colour of organic layer: orange
Trend in oxidising ability: decreases; Colour of organic layer: purple
Trend in oxidising ability: decreases; Colour of organic layer: orange
Trend in oxidising ability: increases; Colour of organic layer: purple
Group 7 Questions
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.