$X(aq.) + Na_2O_2 \to Y(aq.) \xrightarrow{BaCl_2} Z \downarrow_{\text{Insoluble in dil. } HCl}$
$X$ and $Y$ are different sodium salts. Then the anion present in the salt $(X)$ is:

  • A
    $Cr_2O_7^{2-}$
  • B
    $C_2O_4^{2-}$
  • C
    $SO_3^{2-}$
  • D
    $SO_4^{2-}$

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Consider the following list of reagents:
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