Which of the following ions produces violet vapors upon reaction with concentrated $H_2SO_4$?

  • A
    $Cl^{-}$
  • B
    $I^{-}$
  • C
    $Br^{-}$
  • D
    $NO_3^{-}$

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The incorrect statement in respect of the chromyl chloride test is:

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

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