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In which of the following reactions conc. H2SO4 is used as an oxidising reagent?

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In which of the following reactions conc. H2SO4 is used as an oxidising reagent?

(i) CaF2 + H2SO4 → CaSO4 + 2HF

(ii) 2HI + H2SO4 → I2 + SO2 + 2H2O

(iii) Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O

(iv) NaCl + H2SO4 → NaHSO4 + HCl

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(ii), (iii)

(ii) 2HI + H2SO4 → I2 + SO2 + 2H2O

(iii) Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O

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