[AFMC 1998]
A) $ KMnO_4+NaCl $
B) $ K_2Cr_2O_7+MnO_2 $
C) $ Pb_2{{(NO_3)}_4}+MnO_2 $
D) $ K_2Cr_2O_7+HCl $
Correct Answer: D
$ K_2Cr_2O_7+14HCl\to 2KCl+2CrCl_3 $ $ +7H_2O+3Cl_2 $
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