$H_{2} S O_{4}$ acts as a strong oxidising agent. In which of the reaction, is it not acting as an oxidising agent?

C u + 2 H_{2} S O_{4} \to C u S O_{4} + S O_{2} + 2 H_{2} O

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C + 2 H_{2} S O_{4} \to C O_{2} + 2 S O_{4} + H_{2} O

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C a F_{2} + 2 H_{2} S O_{4} \to C a S O_{4} + 2 H F

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S + 2 H_{2} S O_{4} \to 3 S O_{2} + H_{2} O

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Solution

The correct option is C $C a F_{2} + 2 H_{2} S O_{4} \to C a S O_{4} + 2 H F$
In the reaction, $C a F_{2} + 2 H_{2} S O_{4} \to C a S O_{4} + 2 H F$ , $H_{2} S O_{4}$ is not acting as the oxidising agent.
Since there is no change in the oxidation number of any element hence it is not a redox reaction.

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