Hydrogen iodide cannot be prepared by the action of concentrated $H_2SO_4$ on potassium iodide because:

  • A
    $HI$ is stronger than $H_2SO_4$
  • B
    $HI$ is more volatile than $H_2SO_4$
  • C
    $H_2SO_4$ is an oxidising agent
  • D
    $H_2SO_4$ forms a complex

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