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In which of the following reactions conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) is used as an oxidising reagent?
(i) \( \mathrm{CaF}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{CaSO}_{4}+2 \mathrm{HF} \)
\( \mathrm{P} \)
(ii) \( 2 \mathrm{HI}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{I}_{2}+\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{O} \)
W
(iii) \( \mathrm{Cu}+2 \mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{CuSO}_{4}+\mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{O} \)
(iv) \( \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{NaHSO}_{4}+\mathrm{HCl} \)
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