CHAPTER 3 GROUP-7 HALOGENS SEMESTER2


 

 













 
 



   

                  
















 





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OXIDATION NUMBER CALCULATION 

  Rule 1 In free elements the oxidation number is 0 e.g. Na = 0, Cu = 0, P = 0, H2 = 0, S8 = 0 Cl2 = 0  A free element is a...Rule 2 The sum of all the oxidation numbers in a molecule is 0. E.g CaCO3 = 0 (NH4)2SO4 = 0

Rule 4 The sum of oxidation numbers in a complex ion is the charge on the ion 2- SO4 = -2 [total] PO43- = -3 NH4+ = +1 NO...


Rule 5 In compounds containing H the Oxidation Number of H is +1 e.g. H2O, HCl, NH4+, CH3COOH Except in metal hydrides w...



Rule 6 In compounds containing oxygen the Oxidation Number of oxygen is -2 Except in (i) peroxides where it is -1 e.g. H2O...







 Oxidation States of Halogens

Halogen
Oxidation States in Compounds
Fluorine

(always) -1*
Chlorine

-1, +1, +3, +5, +7
Bromine

-1, +1, +3, +4, +5
Iodine

-1, +1,+5, +7
Astatine

-1, +1, +3, +5, +7




BLEACHING PROPERTY OF CHLORINE

Chlorine is the basis for the most commonly used bleaches, for example, the solution of sodium hypochlorite








 THE HALOGENS



THE HALOGENS


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