(i) CaF2+ H2SO4 → CaSO4+ 2HF
(ii) 2HI + H2SO4 → I2 + SO2+ 2H2O
(iii) Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O
(iv) NaCl + H2SO4 → NaHSO4 + HCl
Correct Answers:
(ii) 2HI + H2SO4 → I2 + SO2+ 2H2O
(iii) Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O
Explanation: Concentrated Sulphuric acid is used as an oxidising reagent in the following reactions,
2HI + H2SO4 → I2 + SO2+ 2H2O & Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O