What is the oxidation number of underlined element?
I–Cl3
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Solution
Let x be the oxidation number of I in I–Cl3. Since the overall charge on the compound is 0, the sum of oxidation states of all elements in it should be equal to 0. Therefore, x+3(−1)=0 Hence, x=+3. Hence, the oxidation number of I in I–Cl3 is +3.