Why halogens are insoluble in water ?

Halogens (X2) are "non polar" in nature , they are insoluble in water (polar solvent) but in soluble in non polar solvents  like CCl4, C6H6, and CS2 etc.

(1): But Fluorine is soluble in water due to its high oxidizing nature, decomposition even water and form ozonides oxygen.

(2): To increase the solubility of Iodine in water, potassium iodide (KI) is added

Related Questions:

(1) What are the hydrolysis products of urea ?

(2) CCl4 can not be hydrolysed but SiCl4 can be. Why?

(3) Why PCl3 hydrolysed while NCl3 can not be hydrolysed?

(4) Why SF6 behave inert towards hydrolysis?

(5) Arrange in increasing order of extent of hydrolysis [ CCI4, MgCI2, AICI3, PCl5, SiCI4].

(6) Although Sulphur contain vacant d-orbital but SF6 does not under go hydrolysis. Why ?

(7) Arrange the silicon halides into decreasing order of Lewis acids Character? SiF4, SiCl4, SiBr4, SiI4

Why alums are used as Mordant in dyeing ?

Alums are used as Mordant in dyeing because when fabric to be dyed in dipped a solution of alum and heated with steam. Hydrolysis of [Al(H2O)6]+3 deposite Al(OH)3 into the fibres of materials and the dye is adsorbed on the Al(OH)3.