$HBr$ and $HI$ can reduce $H_2SO_4$,$HCl$ can reduce $KMnO_4$,and $HF$ can reduce:

  • A
    $H_2SO_4$
  • B
    $KMnO_4$
  • C
    $K_2Cr_2O_7$
  • D
    None of the above

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