Which of the following reactions shows the behavior of $H_2SO_4$ as an oxidizing agent?

  • A
    $2HI + H_2SO_4 \to I_2 + SO_2 + 2H_2O$
  • B
    $Ca(OH)_2 + H_2SO_4 \to CaSO_4 + 2H_2O$
  • C
    $NaCl + H_2SO_4 \to NaHSO_4 + HCl$
  • D
    $2PCl_5 + H_2SO_4 \to 2POCl_3 + 2HCl + SO_2Cl_2$

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