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Group 7, Group 7 IMF Intermolecular Van Der Waals' forces which becomes stronger down the group as molecules are more polarisable, form instantaneous dipole more easily., Group 7 Reactions Aqueous AgNO3, Group 7 Thermal stability of HX Thermal stability decreases down the group Larger atomic radii Bond length increases Less effective overlap of orbitals Covalent bonds less exothermic down the group, Group 7 Reactions Displacement reactions Halogens higher up can displace those below them., Group 7 Dissociation of HX Acidity of HX increases down the group Larger atomic radii Bond length increases Less effective overlap of orbitals Covalent bonds less exothermic down the group Easier to cleave H-X bond to form H+., Group 7 Reactions sodium hydroxide, Group 7 Solubility in water and non-polar solvents General solubility in water limited and decreases down the group. More soluble in non-polar solvents., Group 7 Reactions Oxidising power Oxidising power decreases down the group., Group 7 Reactions Formation of HX Reaction less exothermic down the group., Group 7 Reactions conc. H2SO4