In which of the following reactions conc. H2SO4 is used as an oxidising reagent?
| a. | CaF2 + H2SO4 → CaSO4 + 2 HF |
| 2. | 2HI + H2SO4 → I2 + SO2 + 2H2O |
| 3. | Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O |
| 4. | NaCl + H2SO4 → NaHSO4 + HCl |
Choose the correct option:
| 1. | (a, b) | 2. | (b, c) |
| 3. | (c, d) | 4. | (a, d) |
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