$X + H_2SO_4 \to Y$ (a colorless gas with a pungent smell).
$Y + K_2Cr_2O_7 + H_2SO_4 \to$ green colored solution.
What are $X$ and $Y$?

  • A
    $SO_3^{2-}, SO_2$
  • B
    $Cl^-, HCl$
  • C
    $S^{2-}, H_2S$
  • D
    $CO_3^{2-}, CO_2$

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