Question

explain the oxidation no of all iodine atom in KI3

Answer 1

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$\textbf{In KI3}$

The oxidation no. of I3 is -1, as oxidation number of alkali metal $\textbf{i.e K is+1}$ in $\textbf{I3- }$the central I atom is in -1 oxidation state while the other 2 are in zero oxidation state. ...


Central iodine has eight valence electrons (hence -1 charge) whereas terminal iodine atoms have seven valence electrons each.


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Answer 2

KI3 is actually formed between K+ and I3- ions.

KI3 :- O. N. of Iodine in KI3 = +1+ (-3x) =

X=1/3 . Therefore the O. N. of iodine in KI3= 1/3 which is not possible. As O. N. cannot be

fractional.

We can consider the structure of KI3.

In I3 ion a co-ordinate bond is formed between I2 and I- ion.The ON of two iodine atoms is therefore

zero.The ON of iodine forming the co-ordinate bond is –1. Therefore the ON of iodine in KI3 is - 1.

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