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JEE Advanced Chemistry question

ChemistryRedox ReactionsJEE Advanced

How many of the following can be an oxidizing agent? H2S, H2SO4, H2SO3, H2S2O3

Answer: 2

Solution

In H2S, sulphur is at its lowest possible oxidation state (−2), so H2S can only be oxidized further — it can act solely as a reducing agent, never as an oxidizing agent. In H2SO4, sulphur is at its highest oxidation state (+6), so it can only be reduced — it readily acts as an oxidizing agent (e.g. towards Cu, as in

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Question ID VK-159545