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What are the oxidation number of the underlined elements in each of the following and how do you rationalise your results?
(a) \( \mathrm{KI}_{3} \)
(b) \( \mathrm{H}_{2} \stackrel{S}{S}_{4} \mathrm{O}_{6} \)
(c) \( \mathrm{Fe}_{3} \mathrm{O}_{4} \)
(d) \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \)
(e) \( \mathrm{CH}_{3} \mathrm{COOH} \)
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