H2SO4 acts as a strong oxidising agent. In which of the reaction, it is not acting as an oxidising agent?
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An oxidizing agent gains electrons and is reduced. Sulfur in H2SO4 has an oxidation state of +6. If it decreases, H2SO4 is acting as an oxidizing agent. If the oxidation state of sulfur remains +6, it is not acting as an oxidant.
In the first reaction: CaF2 + 2H2SO4 → CaSO4 + 2HF, the sulfur oxidation state in both H2SO4 and CaSO4 is +6. No change occurs; it is a simple acid-base reaction, not a redox reaction. Therefore, H2SO4 is not acting as an oxidizing agent here.
Final Answer: CaF2 + 2H2SO4 → CaSO4 + 2HF