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Q. Which of the following sulphur containing species can not act as oxidising agent?

Haryana PMTHaryana PMT 2002

Solution:

Oxidation number of sulphur in $H _{2} S , H _{2} SO _{4} H _{2} SO _{3}$ and $SO _{2}$ are $-2,+6,+4$ and $+4$.
Thus, $H _{2} S$ can act only as reducing agent.