Question:
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
Solution:
Option (ii) and (iii) are the answers.