Question -
Which of the following behaves as both oxidising and reducing agents
Options:
A .  H2SO4
B .  SO2
C .  H2S
D .  HNO3
Answer: Option B : B In SO2, sulphur has a +4 oxidation state. In H2SO4, Sulphur exhibits its highest oxidation state of +6. On the other hand - in H2S, sulphur exists in its lowest -2 oxidation state. Thus, we can surmise that SO2 could act as both an oxidising agent as well as a reducing agent. Nitrogen exhibits its highest oxidation state of +5 in HNO3.
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