group 7 Flashcards
(8 cards)
1
Q
Boiling point trend?
A
Increases — stronger van der Waals
2
Q
Electronegativity trend?
A
Decreases — more shielding
3
Q
Oxidising power trend?
A
Decreases down group
4
Q
Displacement reactions?
A
More reactive halogen displaces less reactive one from solution
5
Q
Reducing ability of halide ions?
A
Increases down group
6
Q
Test for halide ions?
A
AgNO₃ → Cl⁻: white ppt, Br⁻: cream, I⁻: yellow. Use ammonia to confirm.
7
Q
Chlorine in water?
A
Disinfects — forms HCl and HClO (chloric acid)
8
Q
Disproportionation?
A
Element both oxidised and reduced in same reaction
