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In acidic medium, $\ce{K_2Cr_2O_7}$ shows oxidising action as represented in the half reaction $\ce{Cr_2O_7^{2-} + XH^{+} + Ye^{-} \rightarrow 2 A + ZH_2O,  X , Y , Z}$ and $A$ are respectively are:

• A
  $8,6,4$ and $Cr _2 O _3$
• B
  $14,7,6$ and $Cr ^{3+}$
• C
  $8,4,6$ and $Cr _2 O _3$
• D
  $14,6,7$ and $Cr ^{3+}$