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Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?
$$3S+2H_{2}SO_{4} \rightarrow 3SO_{2}+2H_{2}O$$
$$C+2H_{2}SO_{4} \rightarrow CO_{2} + 2SO_2 +2H_{2}O$$
$$CaF_{2}+H_{2}SO_{4} \rightarrow CaSO_{4}+2HF$$
$$Cu+2H_{2}SO_{4} \rightarrow CuSO_{4}+SO_{2}+2H_{2}O$$
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