Which of the following chemical reactions depicts the oxidising behaviour of H2SO4? (a) 2HI + H2SO4 → I2 + SO2 + 2H2O (b) Ca(OH)2 + H2SO4 → CaSO4 + 2H2O (c) NaCl + H2SO4 → NaHSO4 + HCl (d) 2PCl5 + H2SO4 → 2POCl3 + 2HCl + SO2Cl2 .
*In this reaction oxidation number of decreases by two, thus this is a reduction reaction and H2SO4behaves as oxidising agent.**
