Oxidation number of iodine in IO3−,IO4− Kl and l2 respectively are:

IO3-1 x+3(-2)=-1 x-6=-1 x=+5IO4- x+4(-2)=-1 x=+7KI                      x+(+1)=0x=-1KIx+(+1)=0x=-1I2 oxidation states of Iodine zeroO.N. of Iodine are +5, +7,-1 and 0