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Chapter 20
Group 7: The Halogens
20.1 Fluorine Irregularity & Physical State
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20.2 Comparative Halogen Reactions & Stabilities
• F2 > Cl2 > Br2 > I2 (oxidizing power) � forming F1-
> Cl1-
> Br1-
> I1-
respectively
• Remember that the oxidizer is always reduced (0�-1 oxidation number in this case)
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HX Stability
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Reaction with conc. H2SO4
• Note the extent of sulphur reduction by H+ in the case of iodine
• Conc. HCl will have the same oxidizing effect
• Conc H3PO4 is not an oxidizing acid and will only have the acid/base reaction effect
Reaction with AgNO3
Reaction with water (No dissolution)
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Reaction with water or alkali (Redox disproportionation)
Thermo-sensitive chlorate
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