$A$ substance on treatment with dilute $H_2SO_4$ liberates a colourless gas which produces:
$(i)$ turbidity with baryta water and
$(ii)$ turns acidified dichromate solution green.
The reaction indicates the presence of:

  • A
    $CO_3^{2-}$
  • B
    $S^{2-}$
  • C
    $SO_3^{2-}$
  • D
    $NO_2^-$

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