Chemistry 9701: GROUP 17 Topical Past Paper Questions

(a) (i) Define first electron affinity. [1] (ii) Describe the trend in the first electron affinities of chlorine, bromine and iodine. Explain your answer. [2] (b) The lattice enthalpy of potassium bromide, KBr, is $ -670 \, \text{kJ mol}^{-1} $. Predict values, in $ kJ mol^{-1} $…

I he Group 1/ elements are oxidising agents. (a) (i) Explain how the Group 17 elements act as oxidising agents. [1] (ii) Write an equation to show the reaction in which $ \text{Cl}_2 $ oxidises aluminium metal. [1] (iii) A student heats equal amounts of $ I_2(g) $ and $ H_2(g) $…

Chlorine, $ Cl_{2} $, reacts with many elements and compounds to form chlorides. Table 2.1 shows information about some chlorides of Period 3 elements. Table 2.1 (a) Complete Table 2.1. [3] (b) When $ Cl_{2} $ reacts with cold NaOH(aq), $ Cl_{2} $ is both oxidised and reduced. Th…