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  4. Number of oxidants out of the following are Fe3+, SO3, NO-3 , I -, Na

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Q. Number of oxidants out of the following are
$Fe^{3+}, \,SO_{3}, \,NO^{-}_{3} ,\, I ^{-}, \,Na$

Redox Reactions

Solution:

Oxidants : $Fe^{3+} + 3e^{-} \rightarrow Fe$
$N^{5+} + 2e^{-} \rightarrow N^{3+}$
$S^{6+} + 2e^{-} \rightarrow S^{4+}$
These three cannot be oxidised because they are having their maximum oxidation state. $Na$ and $I^-$ cannot accept electrons so they cannot act as oxidant.