Which red-brown gas is evolved when $KCl$ is heated with solid $K_2Cr_2O_7$ and concentrated $H_2SO_4$?

  • A
    $Cl_2$
  • B
    $CrO_2Cl_2$
  • C
    $CrO_3$
  • D
    $H_2CrO_4$

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