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प्रश्न
What are the oxidation numbers of the underlined elements in the following and how do you rationalise your results?
KI3
उत्तर
KI3
In KI3, the oxidation number (O.N.) of K is +1. Hence, the average oxidation number of I is `-1/3`. However, O.N. cannot be fractional. Therefore, we will have to consider the structure of KI3 to find the oxidation states.
In a KI3 molecule, an atom of iodine forms a coordinate covalent bond with an iodine molecule.
+1 0 0 -1
K+ [I - I ← I]-
Hence, in a KI3 molecule, the O.N. of the two I atoms forming the I2 molecule is 0, whereas the O.N. of the I atom forming the coordinate bond is -1.
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