Question

Which of the following reactions depict the oxidising

behaviour of H2SO4 ?

• A. 2PCl5 + H2SO4$\rightarrow$ 2POCl3 + 2HCl + SO2Cl2
• B. 2NaOH + H2SO4$\rightarrow$ Na2SO4 + 2H2O
• C. NaCl + H2SO4$\rightarrow$NaHSO4 + HCl
• D. 2HI + H2SO4$\rightarrow$ I2 + SO2 + 2H2O

Answer 1

Answer: (D)

2HI + H2SO4$\rightarrow$ I2 + SO2 + 2H2O

Answer 2

–1 +6 0 + 4

2HI + H2SO4 $\longrightarrow$ I2 + SO2 + 2H2O

Thus H2SO4 oxidises HI to I2.