Chlorine is liberated when we heat:

  • A
    $KMnO_4 + NaCl$
  • B
    $K_2Cr_2O_7 + MnO_2$
  • C
    $Pb(NO_3)_4 + MnO_2$
  • D
    $K_2Cr_2O_7 + HCl$

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