Calculate the oxidation number of iodine in KI3

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Solution

Dear Student,
KI₃ is actually formed between K+ and I₃^- ions. In I₃^-ion there is a 3 centre 4 electron bond between I₂ & I^- ions, thus making the oxidation state of iodine as -1 as the oxidation states of I atoms in I₂ is taken as zero.
KI₃ ---> KI + I₂
Here I₂ has 0 oxidation state and in KI , +1 for K and -1 for I.
So,the oxidation state of I in KI₃ is -1.
Regards

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