-varies from to .- form most no. of oxides.
i.e. By electrolysis of in presence of .
-These are prepared by heating with Conc.H2SO4 and.
For this is treated with .
-Carnalite is double salt of and it contains impurities and .
-Seas weeds contain impurities and .Iodine is obtained by heating these impurities with and .
Chile salt petre contains impurity caliche.
1)Reaction with hydrogen: It gives acid. Eg:
Halogens combine with metal forming their halides.
3)With non metals:
Halogens combine with non metal forming their halides.
-Similar reaction with and as
5) Oxidising Property
a) oxidizes to .
b) is oxidized by halogen .
c) is oxidized to .
d) is oxidized to .
e) is oxidized to
f) to .
6) Reaction of with slaked lime :
-Carnalite is ore of Mg and is salt of Cl.
-Carnalite is used to manufacture bromine.
-This is also dry test for .
Note: - and can also be prepared by heating Phosphorous, Halogen and Water.
1)Oxidation by air and are oxidized to and .
But is not oxidized.
a) With acidified :
b) With acidified :
c) With :
3) Test reaction :
Silver Nitrate taste is carried out.
= no ppt = Pale yellow ppt
=White ppt = Yellow ppt
-Used to make Aqua regia.
-Used as lab reagent.
-used to prepare that are used in photography and medicine respectively.
-Used as reducing agent.
-Used to make for photography.
-Used to make itching glass
Types and their oxidation number:
-Hypohalous acid =
-Halous acid =
-Halic acid =
-Perhalic acid =
i) Same Halogen:
ii) Different Halogen:
(electro-negativity decreases order )
Thermal Stability of Oxyacid: