$HI$ cannot be prepared by the reaction of concentrated $H_2SO_4$ with $KI$ because:

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

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