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  4. A sulphur containing species that cant be a reducing agent is

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Q. A sulphur containing species that cant be a reducing agent is

VMMC MedicalVMMC Medical 2013

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.