A) \[S{{O}_{2}}\]
B) \[SO_{3}^{2-}\]
C) \[{{H}_{2}}S{{O}_{4}}\]
D) \[{{S}^{2-}}\]
Correct Answer: C
Solution :
If the species is a reducing agent, it means it can be oxidised easily thus it should have oxidation number less than maximum values of oxidation number. In \[S{{O}_{2}},SO_{4}^{2-}\]and \[{{S}^{2-}},\]the oxidation number of S is \[+\text{ }4,+\text{ }4,+\,6,\] and - 2 respectively. Therefore, \[S{{O}_{2}},SO_{3}^{2-}\]and \[{{S}^{2-}}\]can be reducing agent but \[SO_{4}^{2-}\]cant be.
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