A) \[{{I}^{-}}\]
B) \[S\left( s \right)\]
C) \[NO_{3}^{-}(aq)\]
D) \[C{{r}_{2}}O_{7}^{2-}\]
Correct Answer: A
Solution :
[a] If an electronegative element is in its lowest possible oxidation state in a compound or in free state. It can function as a powerful reducing agent, e.g. \[{{I}^{-}}\]
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