Potassium dichromate $(K_2Cr_2O_7)$ is used . . . . . . .

  • A
    as a reducing agent
  • B
    in electroplating
  • C
    as an insecticide
  • D
    as an oxidizing agent to oxidize ferrous ions $(Fe^{2+})$ into ferric ions $(Fe^{3+})$ in acidic media.

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$H_2O_{2(aq)} + ClO_{4(aq)}^{-} \rightarrow ClO_{2(aq)}^{-} + O_{2(g)}$

When acidified $K_2Cr_2O_7$ solution is added to $Sn^{2+}$ salt,then $Sn^{2+}$ changes to . . . . . . .

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