Which statement is not correct about the trends in properties of the halogens from Cl2\text{Cl}_2Cl2 to I2\text{I}_2I2?
The boiling points of the elements increase.
The electronegativity of the atoms decreases.
The oxidising ability of the elements increases.
The bond length of the X−X\text{X}-\text{X}X−X bond increases.
37 exam-style questions on AQA A Level Chemistry Group 7(17), the halogens, covering Trends in properties and Uses of chlorine and chlorate(I). Each one has a worked solution and a mark scheme showing where the marks go.