When a mixture of potassium dichromate and potassium chloride is heated with concentrated $H_2SO_4$,which of the following is produced as red vapors?

  • A
    $CrO_3$
  • B
    $Cr_2O_3$
  • C
    $CrO_2Cl_2$
  • D
    $CrCl_3$

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